Yes, but it's difficult to truly excel when time/energy are divided between two careers. It's almost impossible to have a meaningful professional career while pursuing bodybuilding as well.
Tell that to the aforementioned Ronnie Coleman, who was a cop for most of his bodybuilding career, INCLUDING his first three years as Mr. Olympia.
Then, you have Lee Labrada as an engineer, or Porter Cottrell as a firefighter.
And, wasn't Markus Ruhl selling cars, during many of his bodybuilding years?
Throw in Joel Stubbs, an airline pilot, and Leo Ingram (a retired Chief Petty Officer, from the Navy) and it seems pursuing a meaningful career ain't so hard, after all.