Garrett grew up in Atascosa County, learning the real estate business from his father and the founder of the company, Joe Ruple. After graduating from Texas A&M, Garrett worked in project management in Houston for a fortune 500 company. He eventually returned to South Texas to pursue various oil and gas projects and several real estate developments. Today, Garrett is the owner and Broker of Ruple Properties and oversees the growth of Ruple Properties and its agents across Texas. In 2022, Garrett became a San Antonio Business Journal 40 under 40 honoree.

Garrett lives in San Antonio with his wife and three children. He is actively involved with numerous charities and civic organizations, including Trinity Oaks, a non-profit that provides hunting and fishing opportunities for terminally ill and wounded veterans.