The twin brother of film and TV actor Jason London, Jeremy got his start as a stuntman before making his acting debut playing a bit in sister Dedra's NBC movie "In Broad Daylight" (1991). Brother Jason led to his next job: he had auditioned for the role of Nathan Bedford in the NBC series "I'll Fly Away" (1991-93) but was unable to accept the role so Jeremy filled in. Ironically, Jeremy was unavailable for the 1993 TV-movie and Jason played the role at last. London co-starred in the short-lived series "Angel Falls" (CBS, 1993), and in three 1995 TV-movies, "A Season of Hope" (CBS), "A Mother's Gift" (CBS) and "Breaking Free" (The Disney Channel). In 1995, he joined the cast of the Fox drama series "Party of Five" in the role of Griffin, a boyfriend (later husband) of Julia Salinger (Neve Campbell).

London made his feature debut in a small role in the straight-to-video "The Babysitter", starring Alicia Silverstone. He also had a co-starring turn as one of the lovelorn teens in the comedy "Mallrats" (both 1995).