Working as a freelance cartoonist, Glenn became the first African American and the youngest cartoonist in The Detroit News. His comic strip, “Double Trouble”, was published daily in The Detroit News and ran for three years. In 1998, Glenn was commissioned by Daimler-Chrysler to paint a mural. Later in the year, he was commissioned to paint a second mural for renowned restaurateur, Patrick Coleman. In 2005, his work was featured in his first museum exhibition held at the Charles H. Wright Museum of African American History in Detroit. The museum now hosts one of his paintings in their permanent collection.