The Knox County Sheriff's Department says Matthew Simmons, the founder of the Ocean Energy Institute, drowned at his house on North Haven late Sunday night.

Simmons was a leading investment banker for the energy industry and had recently retired to work full time on the new Ocean Energy Institute.
He was a leading proponent of offshore wind power and had started raising money to develop and build offshore turbines.

He and his family had also bought and rebuilt the Old Strand Theater in downtown Rockland.