our staff

Mary Ann Hille

Co-Founder, President & Trustee

Mary Ann Hille grew up in Tulsa, graduated from Edison High School and attended Oklahoma University where she was a member and officer of Delta Gamma. She met her husband Jo Bob there and later completed her Bachelor of Arts degree at the University of Tulsa. She went on to receive a master’s degree in human relations from the University Center at Tulsa, graduating magna cum laude. She worked as a high school and elementary school teacher, a case manager, and as a volunteer for many positions on PTA boards, church groups, and community service agencies, and presently serves as the President and Trustee of the Hille Foundation.

Mary Ann has served on the boards of Iron Gate, St. Simeon’s Episcopal Home, The First Tee, the Women’s Leadership Council of the United Way, Crosstown Learning Center, Lindsey House, Tulsa Community College Foundation, the YWCA and Inverness Advisory Boards. She is an ordained Presbyterian Elder, a Stephen Minister caregiver, and a grandmother to seven grandchildren.

Maggie Yar

Executive Director & Trustee

Maggie is the Co-Trustee and the current Executive Director of the Hille Foundation and has held both positions since 2002. She is the youngest daughter of the Hille Foundation’s co-founders, Jo Bob and Mary Ann Hille. Maggie is a proud graduate of Booker T. Washington High School.  She worked in  non-profit positions and practiced law in Dallas in the area of commercial litigation before taking on the role of Executive Director of the Foundation. She earned a B.A. from the University of Michigan in 1995 and her Juris Doctorate from Southern Methodist University in 2001.

Maggie is currently serving on the board of Booker T. Washington High School Foundation, John Hope Franklin Center for Reconciliation, Revitalize T-Town, the Tulsa Area United Way and the Tulsa Race Massacre Centennial Commission Steering Committee.  On each of these boards she holds or has held numerous positions including, Grants Committee Co-Chair, Board Chair and Development Committee Co-Chair, Foundations Chair and Chair of Economic Development.  She has served as an officer and/or board member of a number of other area non-profits including; Carver Middle School Foundation, the OU-Tulsa Advisory Board,  Juvenile Diabetes Research Foundation, Crosstown Learning Center, Saint Simeon’s Foundation, the YWCA of Tulsa, Eisenhower International School Foundation, and the Harold Hamm Diabetes Center.

Maggie and her husband, Kajeer Yar, have three children.

Shirley Martin

Grants Manager & Board Member

Shirley is a Board Member and the current Grants Manager of the Hille Foundation and has been with the foundation since 2004. Shirley is the niece of the Hille Foundation’s co-founders, Jo Bob and Mary Ann Hille. Shirley grew up in Kansas City, Kansas and attended Washburn University in Topeka, Kansas.

Shirley currently serves as board President of Bit by Bit Therapeutic Riding Program where she has been a weekly volunteer for eleven years. She has also served on the Tulsa Police Department’s Mounted Patrol Horse Adoption Committee for the past eight years. She has served on the advisory board of Tulsa Girls Art School and on various committees for the YWCA and the Center for Individuals with Physical Challenges in Tulsa and held various volunteer and board appointments in the north Texas area before coming to Tulsa in 2004.

Shirley has a son, daughter-in-law, and two grandchildren.

Leslie Hamrick

Report Officer & Board Member

Leslie has been a Board Member since the Foundation’s inception in 1997 and joined the staff as a Grant Report Officer in 2002, working from her home in Augusta, Georgia. Leslie is the oldest daughter of the Hille Foundation’s co-founders, Jo Bob and Mary Ann Hille. She earned a B.F.A. from the University of Kansas in 1991 and an M.A. in art therapy from the School of the Art Institute of Chicago in 1993.

After practicing art therapy for several years, Leslie settled into volunteering in her community. She has served on the YMCA Board and Capitol Campaign Committee, the Stevens Creek Elementary PTO, the Stallings Island Middle School PTO, and worked with the Girl Scouts of the Central Savannah River Area, held many positions on school PTO Boards, and served on the Lakeside High School Advisory Council. Recently, Leslie has been guiding weekly art groups at the Augusta Training Shop, which is her true passion.

Leslie and her husband Mark have two children.

Sheila Lequerica

Report Officer & Board Member

Sheila Lequerica has been a Board Member of the Hille Foundation since its inception in 1997 and has served in her position as a Grant Report Officer since 2002. She is the middle daughter of Jo Bob and Mary Ann Hille, founders of the Hille Foundation. Sheila earned her Bachelor of Science from Colorado State University in 1995 where she played on the Women’s Polo team taking them to numerous championship matches. Sheila offices out of her home in Sealy, Texas, where she and her husband own and operate a polo pony training ranch. Sheila is a professional horse trainer and polo player.

Sheila has served as a community volunteer and fundraiser for the Brookwood Community, her church, and in various capacities at Faith Academy in Bellville, Texas. She and her husband, CJ, have two children.

Renee’ S. Smith

Office Manager

Renee’ S. Smith began working with the Hille Foundation in 2009 and has served as the Office Administrator since that time. Renee’ graduated from Oklahoma State University with a Bachelor of Science Degree in Family Relations and Child Development in 1990. Renee’ was employed in various teaching positions, including a Pre-Kindergarten teacher at Day Schools in Tulsa, Oklahoma from 1991 until 2006. She was the Director of Day Schools Temple Israel site from 2006 to 2008.

Renee’ volunteers her time with The American Cancer Society as a Road to Recovery driver and with The Lydia Project.  She is an aunt to her five nieces and nephews.