Personal Info:
Real Name: Jack Mallard
Also Known As: No known Alias
Place Of Birth: Unknown
First Appearance: Power Man Vol.1 #18 (1974) Bronze Age Villain
Known Associates: No known Associates
Group Affiliation: None
Base Of Operations: New York City, New York
Grudges: Luke Cage, Power Man
Creators: Len Wein and George Tuska
Enhanced Abilities: Steeplejack seems to have superhuman strength, endurance and durability.
Weapons: Steeplejack built himself a special double-barrelled pistol. One mode can shoot bursts of red-hot rivets, the other can shoot a long “super-acetylene” torch, fed via an armoured cable from his backpack.
Jake Mallard and his two brothers were construction workers in New York City, employed by contractor Maxwell Plumm. They were unaware of Plumm's business practices, which included bad quality construction gear and budget cuts in security, so that he could earn more money.
Due to those practices, Jake's brothers both died in a fall due to a sudden wind slipping the cable of a girder. Jake noticed the sub-standard materials and the security practices and swore he would have his revenge on Plumm. He then created a custom identity for himself, the Steeplejack, and designed weaponry basing on specialized construction tools.
Steeplejack I at Marvel Database
Steeplejack I at WriteUp's.Org
Steeplejack I at Comic Vine