Our Team

 Mary Van Haneghan, Ed. D. – Executive Director 

Dr. Mary started her career in the human services field almost two decades ago as a direct service professional. During her tenure she has worked various capacities: day habilitation; residential habilitation; case management; supported employment; behavioral health; nursing and early intervention. She received her doctorate in education, with emphasis in higher education and adult learning, from Walden University in 2012; a master of science degree, with emphasis in adult education and literacy, from Buffalo State College in 2007; and in 2006 she received a bachelor of arts degree, with emphasis in business management, from the University of Buffalo. Her academic research has ranged from historical institutional models to the benefits of post-secondary.

Prior to coming to The Arc of the Capital Area she served as the Chief Executive Officer of The Arc of Anchorage.  In October of 2015 the National Conference of Executives of The Arc of the United States (NCE) Annual Awards Committee chose Dr. Mary to receive the 2015 “Rising Star Award.” Dr. Mary was recognized for her accomplishments and contributions through her work on behalf of people who experience intellectual disabilities and their families. The Rising Star Award acknowledges chapter leaders   of The Arc that support the national organization’s core values: people first, equity, community, self-determination, diversity and integrity.

Dr. Mary is actively involved in the Austin community through the Aging and Disability Resource Center of the Capital Area Steering Committee, the Intellectual & Developmental Disabilities Alliance of Central Texas, the Best Single Source Plus Executive Director Committee, One Voice Standards of Excellence Committee and Texas Young Professionals.

Will Bayley – Chief Financial Officer

Will joined The Arc of the Capital Area as CFO in April 2013.  He manages the overall financial and budgeting operation of the organization.  Will’s 30 years in finance includes time working with nonprofit organizations, cooperatives, and commercial businesses.  In addition to finance and accounting, Will also has extensive experience with strategic planning and data analysis.  He holds a Bachelor’s degree in Psychology from Virginia Tech.





Tammy Sullivan – Director of HR and Operations

Tammy joined The Arc of the Capital Area in December 2016 as the new HR and  Operations Director. She has a Bachelor’s Degree in Sociology from Texas State University in San Marcos, Texas. Before joining The Arc, Tammy’s 15 years of Human Resource and Operations work includes a focus on employee development, staffing, retention, training and process efficiency.

When Tammy isn’t at The Arc she is devoting her time to the Austin community. She serves on the Board of Directors for a startup non-profit here in Austin that provides free care supplies to cancer patients.




Diana K. Trevino, MSW – Director of Agency Services

Diana joined The Arc of the Capital Area in October 2013 as Manager of Case Management Services before becoming Director of Agency Services in October of 2015. Diana has over 15 years’ experience as a program manager for statewide intellectual and disability (I/DD) services on the island of Oahu, Hawaii where she specialized in developing therapeutic programs and crisis shelters for the I/DD population, conducting trainings and managing multiple programs on all islands. During her time in Hawaii she collaborated with The Arc of Honolulu and The Arc of Kona, among other nonprofits, on crisis network solutions for the I/DD population. Diana also spent a year on the Big Island of Hawaii as an ER/forensic and medical social worker. After moving back to Texas in 2013, she realized that community nonprofit services was where she felt most at home, and moved to Austin to work for The Arc of the Capital Area. Diana received her Master’s in Social Work from the University of Hawaii, Manoa with a concentration in mental health.



Lauren Phillips – Director of Marketing and Development

Lauren moved to Austin in 2002 and has held director level positions in fundraising, public relations, marketing and event coordination over the past 15 years. Before joining the team at The Arc of the Capital Area, she worked at The Moody College of Communication at UT and is the Events Director for The Flatwater Foundation. In 2016, Lauren helped to raise $515,000 for The Flatwater Foundation in support of fully funding cancer therapy sessions.

Lauren holds a bachelor’s degree in English with a minor in communications from The University of Texas at Austin. She is also actively involved with Junior League, The Flatwater Foundation and their annual Dam That Cancer event and has served on our gala committee.