Toroid Corporation of Maryland (TCM) is a privately held corporation, founded in 1982. Gunnar Ennerfelt, its president and owner, holds an MSEE degree from the Royal Institute of Technology in Stockholm. Prior to immigrating from Sweden in 1982, Gunnar Ennerfelt had founded Toroid Transformator AB (TTAB) in Vaxjo, Sweden in 1978, preceded by five years as the president of Transductor AB, a company that pioneered the development of labor saving manufacturing methods of power toroids in the late sixties.