Our Team

On Call International, is home to a team of experts with a commitment to service and professionalism.

Meet our team of travel risk management experts. From medical professionals to claims experts, we stand ready to support and protect our travelers and their organizations. Interested in joining our team? Visit our career opportunities.

Senior Leadership

Tom Davidson

As On Call International's President, Tom Davidson leads the company's vision of delivering the highest quality travel risk management and assistance services for organizations and their travelers. Tom maintains a relentless focus on developing customized programs to meet our client's unique needs.

Prior to becoming On Call's President, Tom spent five years as the company's Vice President of Sales and Marketing. In this role, he focused on expanding business development and account management operations while preserving and increasing On Call's high level of customer satisfaction and service delivery. Tom was also responsible for leading the company's strategic initiatives and priorities with a focus on innovation, new technologies and expanding lines of business.

Over the last ten years, Tom has held various roles in the travel risk management and assistance industry. Previously he served as Manager of Account Management at International SOS Assistance Inc., where he oversaw client communications before, during and after crises in India, Haiti, Chile, Egypt, Libya, Japan and New Zealand. He also acted as the logistics lead for operations and evacuee safety following extraction from Haiti and was responsible for oversight and management of medical, security, aviation, and logistics team members based in Santo Domingo.

Tom's other past positions include Manager of the Recruitment Advertising Department at Philadelphia Media Holdings and Inside Sales Manager and Regional Operations Manager for EchoStar Satellite L.L.C. Tom holds a BA in Mass Communications from York College of Pennsylvania.

Dr. William Siegart
Chief Medical Officer

Dr. William Siegart joined On Call International in October 2013 and serves as Chief Medical Officer. In his role, Dr. Siegart oversees the supervision and management of the On Call International Medical Department, including thousands of medical cases each year. He provides medical direction for On Call's physicians as well as the Nurse Case Manager and Rescue Nurse teams.

Dr. Siegart received his medical degree from NYIT College of Osteopathic Medicine and completed an emergency medicine residency at Pontiac Osteopathic Hospital Emergency Trauma Center. Subsequently, he practiced emergency medicine full-time for 27 years and served as Exeter Hospital Emergency Department Medical Director until November 2013. During his tenure at Exeter Hospital, Dr. Siegart served as the EMS Director, Chair of the Peer Review Committee, and Chair of the Professional Practice Evaluation Committee. He was also a member of the New Hampshire Medical Control Board.

Dr. Siegart resides in New Hampshire with his wife and two children. In his free time, he enjoys music, sports, camping, hiking and outdoor adventure activities.

Ryan DeStefano
Vice President of Security

Ryan DeStefano serves as Vice President of Security and oversees On Call’s team of Global Security Specialists. In this role, Ryan is responsible for the development, implementation, and management of the organization’s security assistance services, products, and strategies. He also provides thought leadership on industry trends and best practices. Ryan comes to On Call with over 15 years of diverse security and management experience including three different Fortune 100 companies in the manufacturing and financial services industries.

Prior to joining On Call, Ryan was the Security Director for Liberty Mutual Insurance. There, he led the strategy and operations to mitigate security risk and exposure and had program responsibility for over 500 offices and 40,000 employees. Previously, he also worked at Proctor and Gamble and the Gillette Company as part of their respective Global Security teams. He was responsible for a wide range of security management domains including crisis management, event security, physical security, and investigations.

Ryan has a Bachelor of Criminal Justice, Master of Criminal Justice, and an MBA in International Business and Supply Chain Management from Northeastern University.

Scott Sanders
Vice President of Operations

Scott Sanders joined On Call International in 2010 as Vice President of Operations, with an exemplary record of leading customer service and operations for mid-size and Fortune 500 companies. He is responsible for overseeing and managing all aspects of On Call's Global Response Center, from case management and medical transports to customer service. The Global Response Center handles over 40,000 cases per year. Prior to this position, Scott held the role of Site Director at Sykes Enterprises, Inc., where he was responsible for overseeing the operating environment and support services of AT&T. Scott also served as the Contact Center Site Director for Florists' Transworld Delivery, Inc. (FTD), where he led the Little Rock Call Center, the largest FTD customer service and order processing center in North America.

Scott received a Bachelor of Science in Business Administration and Marketing from the School of Management at Boston University and a Master of Business Administration from Southern New Hampshire University.

Linda Gavin
Chief Financial Officer

As On Call International's Chief Financial Officer, Linda Gavin brings more than twenty years of financial and accounting experience to On Call and is primarily responsible for the financial and accounting operations of the company. This includes production of financial reports, maintaining an adequate system of accounting records, and setting up a comprehensive set of controls and budgets designed to mitigate risk. She also ensures that reported results comply with standard accounting principles and ensures the accuracy of the company's reported financial results.

Gavin previously served as Director of Finance and Administration at Concordia Partners LLC where she directed all aspects of finance, accounting, budgeting, analysis, tax, and cash management for a $13.5 million direct marketing healthcare company. In addition, Gavin was responsible for the company's fixed assets, inventory, and risk mitigation. She also managed a twenty-person call center, and handled human resources and payroll for a fifty-person staff.

Past positions include Assistant Controller for Liberty Mutual Group where Gavin was responsible for leading the Cash Management Controls department. She also served as Liberty Mutual's Manager of Treasury Operations, managing the Accounts Payable and Employee Reimbursements departments.

Gavin is a CPA, received her MBA from the University of New Hampshire and holds a BA in Accounting from the University of Vermont.

Larry Moore
Vice President of Information Technology

Larry Moore, Vice President of Information Technology, joined On Call International in May 2015. He brings his 20 years of experience, technical skills and leadership background to shape the company's long-term technology planning, strategy and implementation.

Most recently, Larry served as the Director of Information Technology for Southern New Hampshire Health System, supporting more than 500 primary and specialty care providers. He also served as a Director of Information Technology for an international publishing company where he was responsible for all the technical needs for their North and South America office locations.

Larry has a specialization in Computer Science and Robotics. He is involved with the Healthcare Information and Management Systems Society (HIMSS), the New England Chapter of Information Systems Security Association, a certified Penetration Security Specialist, and also a member of his college's computer advisory committee. In Larry's spare time, he enjoys traveling, spending time outdoors, camping, motorsports, sailing and spending time with his wife and two children. Larry is also a board member on the Hollis Nor'easters Snowmobile Club.

Jennifer Brunelle
Vice President Of Claims

Jennifer Brunelle, Vice President Of Claims, joined On Call International in December 2000 as a Claims Supervisor. Jennifer also serves as HIPAA Compliance Officer. She was promoted to Finance Manager in February of 2004, assuming responsibility for supervising accounts payable and receivables, maintaining accurate and timely invoicing, and managing several trust accounts and seven Bank of America accounts. In April 2006, Jennifer earned the title of Director of Claims and was promoted to Vice President of Claims in November of 2015. She is responsible for interpreting insurance benefits for many different policies and terms and conditions for various memberships. She is also responsible for state reporting compliance. Jennifer holds a producer's license for P&C in all 50 states.

Jennifer came to On Call from Health Plan Services in Merrimack, NH, where she was initially a claims supervisor and was quickly promoted to policy trainer for major medical policies such as United HealthCare and Blue Cross Blue Shield. She remained at Health Plan Services for 10 years, training and supervising claims adjudication with a concentration on EDI submissions, HIPAA Compliance, auto adjudication and performing audits on large dollar hospital bills.

Sales & Marketing

Diane Hanlon
Regional Sales Director

Diane Hanlon joined On Call in October 2013 as Regional Sales Director, where she focuses on helping businesses and universities reduce risk for traveling employees, expatriates, students and faculty. Diane has more than 17 years' experience and achievement in Fortune 500 B2B sales, account management and contract management. Prior to joining On Call, Diane served as Area Sales Manager for Strategic Commercial Accounts for Enterprise Holdings (operating Enterprise and National Car Rental). Diane was promoted to the Sales Management position from a Senior Sales Account Executive position, and prior to that, worked as an Account Executive. Diane has received numerous professional accolades for her work, including two Exceptional Achievement Awards.

Diane holds a BS in Business Administration from Kutztown University. In her spare time, she enjoys running and spending time with her husband and two children.

Kelly Clement
Regional Sales Director

Kelly Clement joined On Call in January 2014 as Regional Sales Director, where she focuses on helping businesses and universities implement customized risk management programs for traveling employees, expatriates, students and faculty. Kelly has more than 11 years of experience in the travel and hospitality industry. Prior to joining On Call, Kelly served as Regional Director of Sales for FCm Travel Solutions where she specialized in travel management solutions for medium-sized companies.

Kelly holds a BA in Marketing from Ohio University. In her spare time, she enjoys soccer and traveling the world.

Michelle Shelton
Director of Marketing

Michelle Shelton, Director of Marketing, focuses on strategies to grow the company's brand awareness through digital and traditional marketing.

Previously, Michelle served as the company's Marketing Manager, where she was responsible for On Call's retail product development/sales, brand management, and website development. Michelle joined On Call's Operations team in 2004, where handling special projects for company president and CEO Michael Kelly. In 2006, she transitioned into the position of sales administrator, supporting the company's clients. She began assuming multiple marketing prior to being promoted to Marketing Manager.

Michelle also serves on the U.S. Travel Insurance Association's (USTIA) Technology Committee and holds a Bachelor's Degree in French from Middle Tennessee State University. In her spare time, Michelle enjoys reading and yoga.

Ariel Wiley
Implementation and Utilization Manager

Ariel Wiley joined On Call in May of 2011 as an Account Manager for existing and on-coming academic clients and took over management of the corporate and NGO sectors in January of 2013. Ariel is responsible for implementation and onboarding of new clients, ongoing support, education and renewal of existing clients as well as online support for Searchlight, On Call's proprietary online educational portal and travel risk management hub with travel tracking system. In addition to her account management responsibilities, Ariel contributes to inter-departmental process and protocol development and improvements.

Prior to joining On Call, Ariel worked at International SOS as a Scholastic Program Coordinator and directly supported the Academic Sales and Program Director. She was promoted to Scholastic and Corporate Account Manager in June of 2010 and managed a diverse group of corporate and academic accounts. She was responsible for day to day client support and managing annual renewal business.

In her free time, Ariel enjoys traveling and spending time outdoors hiking and camping.

Melissa Tollie
Director Of Account Management

Melissa Tollie joined On Call International in June 2006 as an Assistance Coordinator, helping customers traveling around the globe with emergency medical and travel assistance services. Two years later, Melissa joined On Call's growing marketing department as the Marketing Coordinator, conducting market research, developing press releases, as well as planning and coordinating tradeshows and conferences. She was instrumental in creating On Call's proprietary worldwide medical provider database.

In 2010, Melissa transitioned into a sales and account management role, assisting the sales team in maintaining long-term business relationships with existing clients and developing relationships with new clients. Melissa was appointed Manager of Key Accounts in 2012. As Manager of Key Accounts, Melissa worked hand-in-hand with clients, supporting their needs and helping them to develop and execute their travel assistance programs. She was promoted to Director of Account Management in September of 2015.

Melissa holds a BA in Business Administration with a concentration in Marketing and Spanish from the University of New Hampshire. In her spare time, Melissa enjoys DIY design, traveling and cooking.

Kristen (O'Neil) Davidson
Client Operations Manager

Kristen (O'Neil) Davidson , Client Operations Manager, joined On Call International in March of 2007.

Kristen spent more than five years in On Call's Global Response Center, starting as an Assistance Coordinator where she handled travel and medical assistance cases. Kristen transitioned to Senior Assistance Coordinator in 2010, handling urgent or escalated medical or political evacuation cases. In 2011, Kristen was promoted to Operations Supervisor, where she managed a team of Assistance Coordinators, conducting biweekly reviews and overseeing daily case activity. Kristen was promoted to Client Operations Manager in 2012 serving as a liaison between On Call International and its clients.

Kristen attended Keene State College with a major in Communications and previously worked for the New England Patriots. In her spare time, Kristen enjoys hiking, running and spending time with her son.


Kristin Toth
Director of Operations

Kristin Toth has developed a unique set of skills during years at On Call International. From overseeing political evacuations in the Middle East to medical transports from Mount Everest, each day presents itself with a new challenge and opportunity. After spending five years as an Operations Supervisor, she served as the Quality and Training Manager for three years. In this position, Kristin successfully prepared new hires to face the challenges involved with working in the Global Response Center, while facilitating an effective and enjoyable environment for professional development. She transitioned to her current role in late 2014, and will continue to contribute her knowledge and experience to the ongoing development of our Assistance Coordinator and Supervisor Teams.

Kristin attended Keene State College, where she majored in Historic Preservation and Conservation. She enjoys travel, urban gardening, and is a devoted beekeeper.

Chrissy Valdez
Quality Manager

Chrissy Valdez joined On Call International in January 2011 as a multilingual Assistance Coordinator. Her customer service skills and ability to handle complex cases led to her promotion to Senior Assistance Coordinator in 2012. Shortly after, Chrissy proved her leadership capabilities were instrumental to team development and was promoted to Operations Supervisor. In this role, Chrissy managed escalated cases and high priority evacuations, while overseeing a team of Assistance Coordinators. After excelling in that position, Chrissy was promoted to Training and Quality Manager in December 2014 and to the position of Quality Manager in January 2016. In addition to training new employees, she manages a Quality Team and works closely with staff in the Global Response Center to ensure their career development paths and ongoing education and improvement.

Chrissy attended Keiser University in Florida and is an avid New England sports fan. In her free time, she enjoys spending time with her family, attending baseball games and playing with her two German Shepherds.

Gabrielle Hosea (Bartusiak)
Director of Clinical Transport

Gabrielle Hosea joined On Call International in July 2014 as the company's Director of Clinical Transport. In her current position, Gabrielle is responsible for overseeing the end-to-end quality of medical care provided by commercial flight medical personnel, including hiring, training and educational requirements pertaining to CAMTS accreditation standards and processes.

Gabrielle founded Rescue Nurse International (RNI) in 2008 and served as President and CEO before the company was acquired by On Call in 2014. Under Gabrielle's leadership, RNI provided commercial medical escort services to and from virtually every corner of the globe while assisting hundreds of patients. RNI was the first commercial medical transport company to be accredited by the Commission on Accreditation of Medical Transport Systems (CAMTS). Before founding RNI, Gabrielle worked in several specialty clinical settings ranging from emergency and operating departments to international patient transports.

Gabrielle has traveled to more than 80 countries and is licensed as a registered nurse. She has been certified in Trauma Nursing, Operating Room, Advanced Cardiac Life Support and Pediatric Advanced Life Support. In her spare time, she enjoys hiking and skiing with her family and doing many other activities that Colorado and the Rocky Mountains have to offer.

Finance & Claims

Shannon M. Mitoulas
Director of Accounting

Shannon Mitoulas joined On Call in June of 2012 as the Accounting Manager. Shannon is responsible for the timely and accurate completion of the month-end close, monthly financial reporting for individual company departments as well as revenue analysis. Prior to joining On Call, Shannon worked as the Assistant Corporate Controller at Emerson Ecologics for five years, where she improved the monthly financial reporting package by creating custom reports, led a financial merger and managed the accounting department staff. Previously, Shannon worked at Axsys Technologies as the Accounting Manager. Shannon has an extensive background in corporate and general accounting, cost accounting, mergers and conversions, project management, process development and regulatory and compliance reporting.

Shannon holds a BS in Accounting and Finance from Southern New Hampshire University. In her spare time, she enjoys spending time with her family and riding her motorcycle.

Tom Keller
Claims Manager

Thomas Keller, Claims Manager, joined On Call International in December 1999 as an Assistance Coordinator. He was promoted to Operations Supervisor in the summer of 2002 and in January 2003, he moved to the Finance Department where he was responsible for overseeing claims activity and recording transactions on our accounting system. Tom has been instrumental in re-pricing major medical claims and subrogation collections from primary insurance carriers.

In 2008, Tom was promoted to Claims and Finance Supervisor where he was responsible for booking monthly premium revenue and creating premium reports for our clients. He created new internal and external workflows to gain efficiencies in the department and established the quality and accuracy review program for the finance staff. Tom was promoted to Claims Manager in 2010.

Tom came to On Call from Consolidated Group Claims in Merrimack, New Hampshire, where he worked for five years, gaining three years' experience as a claims examiner and two years' experience in overpayments and recoveries.

Kerri Howard
Insurance Claims Manager

Kerri Howard, Insurance Claims Manager, joined On Call International in October 2012, where she also leads many of the company's HIPAA initiatives. Kerri came to On Call from MetLife Auto and Home in Lowell, MA, where she was initially a Claims Adjuster and was quickly promoted to a Senior Claims Adjuster and then Unit Lead Senior Claims Adjuster, handling claims across the country. Prior to Metlife, Kerri worked at Liberty Mutual as a Claims Adjuster and was promoted to Senior Claims Adjuster, then to Bodily Injury Adjuster and eventually Bodily Injury Field Investigator. Kerri currently holds an adjusters license in 29 states and holds a BA in Communications from the University of New Hampshire. In her spare time, Kerri likes to golf and go for a run.

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