Harry Brearley
Harry Brearley (18 February 1871 – 14 July 1948) was an English metallurgist, usually credited with the invention of "rustless steel" (later to be called "stainless steel" in the anglophone world).
Stelio Belletti
Stelio Belletti is recognized to have been on the forefront of bicycle frame construction, always pushing the boundaries and experimenting with new solutions. He remembers being one of the first manufacturers to make stainless steel frames. 
Belletti continued to work in his family’s workshop until 1990 when the company closed. 
Over the following years, Belletti collaborated with other Italian brands producing TIG welded frames made with steel or aluminum tubing. 
Upon his retirement, Stelio Belletti has devoted his time to sports, participating in several cycling events, and even organizing some himself.