He was born in St. Louis, Missouri. At age twelve, Leeuwenberg was diagnosed with type 1 diabetes. Leeuwenburg coauthered the book Yes I Can! Yes You Can! with Denny Dressman, an autobiography that focuses on his struggles with diabetes and his journey to the NFL.
Leeuwenburg currently works as a college football analyst on The mtn television network, of the NCAA Mountain West Conference. Leeuwenburg is also an elementary school teacher at Colorado Academy. Colorado Academy is a high-achieving private K-12 school in Denver, with high professional and academic expectations from every teacher. Students and families have consistently had great things to say about being in Mr. L's classroom.