Career
With the elevators not working after the attack, Beyea had no way of getting out. Rather than go down the stairs and try to save himself, Zelmanowitz chose to stay with his friend, and presumably comfort him until the bitter end (many believe they prayed together during those final moments as well. As Beyea was a devout Roman Catholic).
At the National 9/11 Memorial, Zelmanowitz is memorialized at the North Pool, on Panel North-65.