Eisenmann was born in Houston, Texas, the son of Ruth Ann (née Gumney) and Albert Able Eisenmann Sr., an actor who appeared as "Cadet Don" on an eponymous children's television show that aired on KTRK (Channel 13) in Houston from 1959 to 1968. Ike's younger brother, Albert Able "Al" Eisenmann Jr., is also an actor, as are Al's daughter Hannah and her brother Stone.
Having appeared on TV shows in the early 1970s, Ike Eisenmann first came to prominence as Tony, the brother of Tia (Kim Richards), in Walt Disney Productions' film Escape to Witch Mountain (1975) and its sequel, Return from Witch Mountain (1978). For Green Giant commercials in the 1970s and 1980s, he voiced the Little Green Sprout. He also appeared in Star Trek II: The Wrath of Khan (1982) as engineering cadet Peter Preston, Chief Engineer Montgomery Scott's nephew.
Eisenmann starred in the NBC TV series The Fantastic Journey, and made appearances in other series including CHiPs, T. J. Hooker, The Jeffersons, Wonder Woman, Kung Fu, Mannix, Little House on the Prairie, several episodes of Gunsmoke, and several appearances on the ABC Afterschool Special. He also appeared in the TV movies Devil Dog: The Hound of Hell and Terror Out of the Sky in 1978. Eisenmann starred in the made-for-television 1982 movie Dreams Don't Die as New York subway graffiti artist Danny Baker, who tries to publish his art professionally. Though not a critical success, the film enjoyed cult status during late night rebroadcasts.

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