As per Rabbins comments above, a high flying high scoring center in Junior converted to defence.
He was literally "stolen" by Red Wings Scout Marcel Cote' from under the noses of the Hab's while playing minor hockey in Shawinigan. He was initially assigned to the minors by Detroit but called up during (I think) the 50 or 51 playoffs' to fill in for Red Kelly who was moved to forward to fill an injury, and helped the Wings to the Cup that year.
He was eventually traded to Toronto where I remember him well as part of the "Over the Hill Gang" of defenders (and forwards really) in the mid-60's, helping the Leafs win their last Cup in 67. The Pronovost of later years wasnt the same as the earlier version of course, playing a more economical, "safe" role, staying back. But apparently in his younger days in Detroit, a speedster opportunist who wasnt averse to head long rushes. Honestly I dont know who you'd compare him to today; maybe a Willie Mitchell type?.
Anyway, poor guy had more broken noses' than Tim Hunter & George Chuvalo combined.
Marcel is of course a member of the HHOF. Much respected. Went on to Coach Buffalo after playing when Imlach was GM of the Sabres. Scouted thereafter with the NHL's Central Scouting Bureau & later with the Devils.
One of my all-time favorites.