Professor Sebastian LoNigro was Sam's mentor at MIT and co-creator of the string theory that underpins quantum leaping. In the episode "Her Charm". Dr. Samuel Beckett uses LoNigro's cabin to hide out with a woman who is under witness protection. At the end of the episode the Professor discovers the two in his cabin. Sam reveals to him that their theory works. The part of Professor LoNigro is played in the episode "Her Charm" by James Hardie.