Center For Refugee Services
About Our Staff

Margaret Costantino, MA, LPC
Executive Director

Margaret is a lifelong resident of San Antonio and has spent over 20 years as a career counselor in higher educational settings. She has three years of experience working in a community mental health program that she co-founded in San Antonio (S.A.), Texas. She has worked with the resettled refugee population in S.A. since 2008 years teaching ESL, citizenship classes, and addressing their psychosocial needs. She earned her Master's in Counseling from the University of Texas at San Antonio and is a licensed professional counselor. She also has 6 years experience teaching at the University of Texas at San Antonio.


Associate Director


About Our Board Members

Jean Sherrill
Board President

Jean is a retired pharmacist, earning her BS in Pharmacy at the University of South Carolina while husband Jody was assigned at Fort Jackson, SC. During Jody's 20 years as an Army officer, Jean was active as a per diem pharmacist, a Red Cross volunteer at military bases, and a community and chapel activities volunteer. The Sherrill's retired to San Antonio in July of 1993, where Jean began her 18 year career as a pharmacist with CVS Caremark Mail Order Division. She retired again in April, 2011. In 2008, Jean became aware of the significant refugee influx into San Antonio and began to serve at the Center for Refugee Services as ESL teacher, transportation provider, and addressed other needs of the community. In July, 2014, Jean organized the all-volunteer craft shop, World Mosaic Market, at CRS to provide a sales outlet for our many talented local refugee artisans as well as work experience for those desiring to go into the retail workforce.


Sheila Adams, PhD, BCD, LCSW

Dr. Sheila Adams received her Bachelor of Social Work from Western Michigan University (1991); Master of Social Work from Our Lady of The Lake University (1992), San Antonio, TX; and her PhD with an emphasis in Social Work Research from the University of Texas at Austin (2002). Dr. Adams is a licensed Social Worker with a Board Certification from the American Board of Examiners. She served 28 years as an officer in the US Army before retiring in 2016. She held an array of leadership positions, i.e.. Department Chief, Manager, Professor/Educator, Principle Researcher, Author, and Consultant. Dr. Adams is published and has presented at many professional conferences. While assigned to Korea (2002-2006), Dr. Adams worked closely with the US Embassy Immigration Office on Service Members and their families issues related to Visas.


James "Jim" Karlak

Retired President and COO, James Karlak Business Consulting


Veena Prasad
Board Member

Dr. Veena Prasad, PHD is A been a long tIME resident of San Antonio. She was a researcher at the UT Health Science center. During her tenure at UTHSCSA , she was on the board of International Alliance, an organization that helped settle researchers who visited the university for training. She has organized several fundraisers for United Way, India Association, Bexar County Justice center along with her daughter Miss. Sapna Prasad. She teaches music and is very involved in local charitable organizations. She also conducts religious Hindu ceremonies such as weddings, naming ceremonies, and the like. She enjoys singing and playing the Veena, which is a musical Instrument.


Brooks Von Biberstein, JD
Board Member

Brooks von Biberstein is fairly new to the San Antonio area. She grew up in North Carolina but lived for many years in Boston. Brooks is an attorney in private practice. She attended the University of North Carolina at Chapel Hill, where she earned a BA in English and a Juris Doctor. She has been involved in social justice advocacy throughout her life and feels fortunate to have the opportunity to work with refugee families who are struggling to establish a new life in Texas. 


Diana Kellerman
Board Member

Diana Kellerman retired from USAA Investment Management Company where she ran the fixed-income (bonds) research department. Diana holds professional designations of Certified Public Accountant and Chartered Financial Analyst. She earned a Bachelor’s degree in Accounting (magna cum laude) from Southwest Texas State University. Diana’s first career was in psychiatric social work. She holds a Master’s in Social Work from Tulane University.


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