San Francisco-based smart space design firm, Stimulant, has announced the addition of Mark Coleran as executive creative director and Sherri Nevins as executive producer. In their new roles Coleran will utilise his experience to enhance Stimulant’s in-house capabilities of creative strategy and execution. Nevins will oversee all production and help Stimulant work in a more integrated fashion with architects, experience design agencies and experiential marketers.