Gil, who first appeared in Season 3, was a young teacher at West Beverly Hills High School. He had friendly relationships with several of his students, including Andrea Zuckerman and Brandon Walsh, who he oversaw on the school paper. At one point, a student named Sue Scanlon falsely accused him of having had inappropriate relations with her. In reality, she'd simply been hurt by his rejection of her advances. Rather than aggressively defending himself, Gil quietly stepped down as the investigation played out. He later explained to Andrea that he'd once had another student fall in love with him, but that the girl had killed herself when he openly rejected her. Eventually, Sue was convinced to come forth with the truth, and Gil returned to his job.
He was later revealed to have become engaged. Throughout high school, Gil supported Andrea in her decision to attend whichever college she thought was best. After she and her friends had graduated, Gil appeared in "Hello Life, Goodbye Beverly Hills"—the episode in which Andrea left town to attend Yale.