It was founded by Augustus Siebe, a German-born British engineer chiefly known for his contributions to diving equipment.

Colonel Charles Pasley, leader of the Royal Navy team that used Siebe's suit on the wreck of HMS Royal George suggested the helmet should be detachable from the corselet, giving rise to the typical standard diving dress which revolutionised underwater civil engineering, underwater salvage, commercial diving and naval diving.

They also made frogman's equipment for the British armed forces during World War 2, and later, sport scuba gear.

Heinke Ltd in London also made diving gear and had connections with Siebe Gorman.

[43] This is a partial list of some of their rebreather equipment covering military and civilian, diving and non-diving.