Glenda C. Mariott graduated from Texas A&M University with a bachelor's degree in Finance in 1979, and in 2013, graduated from St. Mary's University Interior Design program. After graduation from Texas A&M, she held various management positions in the banking industry, rising to the position of Vice President of Operations, Human Resources and Employee Benefits. In 1992, she left the banking industry and began her career in the building, remodeling, and interior design business. She is the owner of G Designs, a build, remodel and interior design firm which has completed residential and commercial projects in the Brazos Valley, as well as throughout the state of Texas. In 2005, she designed for, and managed her construction team in the completion of a 10-day Extreme Kitchen Makeover.
In 2003, she was appointed to the Texas Residential Construction Commission (TRCC) by Governor Rick Perry where she served until 2010; from 2006 through 2009, she served as the vice chair of the commission. TRCC's mission was to promote quality construction for Texans by registering industry members and residential construction projects, providing information and educating homeowners and the residential construction industry, acting as a resource for complainants, and offering a neutral, technical review of alleged post-construction defects. She is a past president of the Brazos County A&M Club and the Bryan-College Station Homebuilders Association. In 1996, the Bryan-College Station Homebuilders Association named her Builder of the Year. At Texas A&M University, she has been a guest lecturer and adjunct professor for the Department of Construction Science. She served on the Board of Directors at The Association of Former Students from 1997 to 2003, and in 2002 was elected Chair of the Board of The Association. In 2013, Glenda received the Texas A&M University Distinguished Alumnus Award, the highest award bestowed upon a former student of Texas A&M University. She is also a member of the Endowed Century Club, 12th Man Foundation, and A&M Legacy Society.