M'Lissa M. Chumbley was first elected to the Board in 1995 and is currently serving her third term as the President of the Board. During her tenure on the Board, she also has served as Vice President, Secretary, and Parliamentarian and as Chair of the Academic and Building committees.

She is a former President of the Northside Council of PTAs and is an Honorary Life Member of both the National and Texas PTAs. Chumbley served as Chairwoman of the Los Leones Student Arts Festival, served on the Vision 2012 Committee for the city of Leon Valley, and received the Time-Warner Hometown Hero Award for community service. She is a member of the O'Connor High School Parent Teacher Student Association, the John Jay High School PTSA, OHS Athletic Boosters, OHS FFA Boosters, and volunteers at the Walter Gerlach Livestock Show. At USAA, Chumbley participates in the Pen Pal, Read to the Children, and Business Careers High School Mentor education programs.

Chumbley is a recipient of the Honorary Chapter Award from the O'Connor High School FFA as well as the Honorary Lone Star Farmer Degree from the Texas FFA Association for her commitment to youth in agriculture. Chumbley also is a Life Member of the San Antonio Livestock Exposition.

She is a graduate of Marshall High School, attended Texas A&M University, and is a 28-year employee at USAA. She and her husband, Steve, have four sons, Boot, Ty, and Chance, all graduates of Texas A&M University, and Colton, a student in Northside. The Chumbleys are active members of St. Luke's Catholic Church.