Board of Trustees » Members


Dr. Ann Calahan Dr. Ann Calahan, Ph.D. - Place 4
Term: 2019-2022
Dr. Calahan is serving her seventh three-year term as a board member and 16th year as President. She also serves as a member of the Texas Association of School Boards Board of Directors. Dr. Calahan is currently Professor and Head for the Department of Curriculum and Instruction (teacher preparation) at Tarleton State University. She holds a BS degree in Elementary Education from Tarleton, M.Ed. in Educational Leadership with Principal Certification from Tarleton, and Ph.D. in Curriculum and Instruction from Texas A&M University, College Station.
Dr. Robert BarbereeDr. Robert Barberee - Place 1
Vice President
Term: 2018-2021
Dr. Robert Barberee is serving his first three-year term. Dr. Barberee has been practicing dentistry in Stephenville since 1997 and is the founder, director, and instructor for the Dental Career Center of Stephenville. Dr. Barberee earned his Bachelor of Science degree in Biology with a minor in Chemistry from the University of Houston. He then pursued his Doctor of Dental Surgery (DDS) degree from Texas A&M Baylor College of Dentistry. He and his wife Jane have 4 children that have all attended SISD.
Sherrie EvansMrs. Sherrie Evans - Place 2
Term: 2018-2021
Mrs. Evans is serving her third three-year term following a one-year unexpired term. Mrs. Evans, a lifelong resident of Stephenville, retired from teaching in 2010 after 28 years of service (24 years with Stephenville ISD - teacher/Stingerette Director and 4 years with Tarleton State University - teacher/Stars Director). Mrs. Evans is currently a real estate agent for Hayden Real Estate.
Keri Vanden Berge

Mrs. Keri Vanden Berge - Place 3

Term: 2018-2021



Mrs. Keri Vanden Berge is serving her third three-year term on the Stephenville Board of Trustees. Keri graduated from Tarleton State University with a major in Interdisciplinary Studies. She then attended Texas Tech University and graduated with a master's degree in Educational Leadership. Keri has been an elementary teacher, assistant principal, and also supervised student teachers.



Mr. Scott OsmanMr. Scott E. Osman - Place 5
Term: 2019-2022
Mr. Scott E. Osman is serving his third three-year term. Mr. Osman has a B.S. in Civil Engineering and Engineering & Public Policy from Carnegie Mellon University and was a Structural Engineer for an international engineering and construction company. Mr. Osman received his Juris Doctorate from the University of Houston and has practiced law in Stephenville since 1994. Recently, Mr. Osman became a partner in an antimicrobial company that cleans, protects, and preserves the environment with non-leaching, non-toxic products. He and his wife Heather have two daughters.

Phyllis StewartMrs. Phyllis Stewart - Place 6

Term: 2020-2023



Mrs. Stewart is serving her first three-year term. She is a lifelong Texan, originally from the west Texas town of Andrews, and has resided in Stephenville for 26 years. She and her husband previously owned and operated Complete Cooling Towers Construction Company and retired recently to manage and operate their cattle, oil, and gas business. Her children were students at Stephenville High School and Tarleton State University. She currently serves as President of the Cross Timbers Republican Women’s Club of Stephenville.


Donny Hill
Mr. Donny Hill - Place 7
Term: 2020-2023
Mr. Donny R. Hill is serving his first three-year term. He is a proud Tarleton State University graduate having earned his B.S. in Exercise and Sports Studies and M.S. in Kinesiology.  Mr. Hill has lived in Stephenville since 1996 and he and his wife have five children enrolled in Stephenville ISD ranging in age from five to fifteen years old. Mr. Hill has been the head personal trainer at Anytime Fitness for over ten years and an adjunct instructor in the Kinesiology Department at Tarleton State University since 2008.