Tim Mosman studied drawing and painting with John Dilg and David Dunlap at the University of Iowa School of Art, BFA 1978 and MA 1985. He earned an MFA at Mills College in Oakland California studying with Jay DeFeo and Ron Nagle from 1986 – 1988. After graduation he found work doing exhibition installation at various Bay Area museums and moved into a studio on 19th Street in West Oakland. Mosman began showing his painting and sculpture at the Dorothy Weiss Gallery in San Francisco in the summer of 1988.

In 1990, Mosman became the Assistant Director of the Mills College Art Gallery and in 1991 he was awarded a painting fellowship at the Millay Colony for the Arts. There he met his partner, painter/sculptor Hank Tusinski and after the residency, the two moved together to the studio in Oakland. Mosman traveled to Seattle in the spring of 1992 for a visiting faculty position at the University of Washington School of Art.

He and Tusinski relocated to Bisbee Arizona in 1994 where Mosman continued to make painting and drawing that was exhibited regularly at venues in the Bay Area and elsewhere. In 1996 they bought an acreage in the desert southeast of Tombstone, Arizona and following a keen interest in sustainable building practices, began designing and building house and studio using alternative as well as recycled materials. That led, quite organically, to a period of concentration on designing and building of custom fine furniture.

Mosman managed the Traveling Exhibitions Program at the Center for Creative Photography at the University of Arizona from 1996 – 97 and from 1998 until the fall of 2003 contracted to design and install temporary exhibitions at the Center. In the fall of 2003 he accepted a position as Exhibition Designer and Principal Preparator at the CCP, a position he currently holds.

Mosman's studio practice is focused on painting and drawing across a variety of media.