Truly one of the best failures S&W ever had.
In the 30's, the design was giving trouble, and Carl Hellstrom, an engineer, was engaged as a consultant. He corrected the design, but it was a commercial failure because of the high manufacturing cost.
They got in trouble with the British 9mm Light Rifle Contract in 1939, and remembered Hellstrom. He was again engaged, demanding a free hand with control of production. He stayed with the company, became Vice President in 43, and then President in 46 when Harold Wesson died. He ran the company till he died in 63 of a heart attack.
It could be argued that Hellstrom had more influence on the history of S&W than any other single person, possibly excepting Horace Smith and D.B.Wesson.