Mike Mullins is the owner and manager of Cranesport Garage, a business incubator in Camden, Maine.  In 2015, Mullins purchased and restored the former Crockett's Quarry across Maverick Street from the Rockland Golf Club.  In 2017 he gained local notoriety for a proposal to buy and convert the MET building in Camden into a makerspace, a shared multidisciplinary workshop with programming for adults and children.

Mullins is on the board or directors of Mullins Management, a Boston-based developer engaged in mixed income housing and historic presentation.  He has sat on the boards of Dublin School, CNU New England, and Caritas Communities, a non-profit dedicated to preservation of Single Room Occupant Housing.  He was a fellow in the 2009 Class of Startup Leadership, and Founder of the Lean Startup Challenge business accelerator, in partnership with MassChallenge in 2011.

Mullins is the Founder of Maine Relief, a Maine Title 13 non-profit that has been producing masks for the community under the name Mid Coast Pop Up Factory.