Gilbert is a retired professional runner, philanthropist, author, and community leader in Austin, where he lives with his wife Triphine and two daughters, Emma and Grace. He is also the owner and founder of Gilbert's Gazelles, one of Austin's largest running training groups, the head cross country and track coach at St. Andrews High School, and a co-founder of the Gazelle Foundation, which provides clean water to people in his homeland of Burundi, Africa.