As an Oregon native, Corey is strongly influenced by the unique relationship between the natural and built environment of the Pacific Northwest. He worked at Richard Potestio and Allied Works Architecture before starting his own design, furniture, and sculpture firm in 1999. He later formed a partnership, M1C2, to undertake a series of high profile projects for the University of Oregon Athletic Department including the design of the Football Team Locker Room. In 2005, he formed a partnership called PATH Architecture, a firm recognized for leading a wave of design driven development projects in Portland. Corey joined THA in 2011.

Corey's work has received wide recognition, including AIA Portland Merit and Craftsmanship Awards and a 2011 Residential Architect Design Award for the Park BOX - a two-unit row house deftly organized to capture views, light and privacy. Other notable projects include Williams Five, a multi-unit, live-work residence that received the AIA Portland Mayor's Award for Design Excellence; and the Butler Residence, an environmentally responsive home that highlights the interplay of city and nature.