Are you referring to Fred Leuctar.
He designed gas Chambers to execute convicted killers in America.
He had a thriving business until he decided to go to Auschwitz and take samples from alleged gas Chambers for analysis.
Needless to say that was the end of his career.
.
No this bloke was interviewed on radio 4
He has designed nitrogen pods for voluntary euthanasia
He was talking about how a mask should not be used
Appeared in the blokes appeal and gave evidence to the effect
Forget his name he was talking about it last week on the’ BBC radio 4 news