Prosser joined CU-Boulder’s architecture school in 1966 and moved to Denver when the program relocated here a few years later, as Patricia Calhoun reported for Westword.

Early in his career in Denver, Prosser authored a proposal to save parts of the Auraria neighborhood from redevelopment, including the Tivoli brewery, which “helped give Auraria much of the character it retains today,” Calhoun wrote.

Prosser saw Denver’s modern rebuilding coming, too. “Believe me, you ain’t seen nothing yet. Colorado doesn’t know what density is,” he told The Denver Post in 2001. And he warned that the city wasn’t intellectually ready for that change.