Steingarten was the CEO of the biotech company BioSyn in 1989, the year of the first novel's events.
During 1995, the events of the second novel, BioSyn's head is Jeff Rossiter. It's unknown why Steingarten was replaced.
Bill Steingarten appears in the comics Jurassic Park: Raptors Hijack II and Jurassic Park: Raptors Hijack III. In the comic, he calls John Hammond at 3:00 in the morning after an attack led by Edgar Prather on BioSyn's headquarters in Cupertino, California. He angrily blames Hammond for the attack's destruction of property and loss of six BioSyn guards. Hammond, however, shrugs off Steingarten's rant, claiming that the attack might have been revenge for Dodgson's sabotage of Jurassic Park which started the Isla Nublar incident of 1993.
Later on in the comic, Steingarten is seen calling BioSyn agents Charlie and Ross to check up on their hunt for Alan Grant, Ellie Sattler, and Ian Malcolm, as well as big-game hunter Robert Muldoon. When the two agents tell them that they have lost track of the four, Steingarten orders the two to find and eliminate them, while also keeping secret the fact that one of InGen's employees is already working for BioSyn.
Steingarten appears for the final time in the Raptor comics run as part of Dr. Jeremiah Fischer's backstory flashback, where he is seen putting Fischer in charge of BioSyn's mission to capture the escaped Velociraptors Alf, Betty, and Celia.