Originally from Los Angeles, California, an interest in all styles of music led Leon to be a member of a working Latin Band (on electric bass) as well as a member of the American Youth Symphony Orchestra conducted by Mehli Mehta (on double bass) at the age of 18. Leon joined the Don Ellis big band in 1977 and became fascinated with Don’s odd time compositions. Also in that same year, Leon became a member of Don Randi’s house band at the Los Angeles jazz club “The Baked Potato” playing a very new instrument – Synthesized Electric Bass (synthesizers triggered by an electric bass).
Leon then went on to record with Gino Vannelli on "Brother To Brother" that went platinum (over one million units sold) in the US and launched Leon's recording career with:
Gino Vannelli - "Brother To Brother." Platinum in US (1,000,000 copies).
Barry Manilow - "Here Comes The Night." - Gold in US (500,000 copies).
Barry Manilow - "A Touch More Magic." - Gold in UK (100,000 copies).
José Feliciano - "Encenas De Amor." - Grammy Winning Album.
Doug Parkinson, Barry White, De Barge, The Stylistics, Demis Roussos, Krokus, Tommy Emmanuel, Maria Muldaur, Phil Keaggy, Doc Severinsen, Boy Meets Girl, Don Ellis, Pat Boone, Jason and the Scorchers, Hanna-Barbera Cartoons, The Joan Rivers Show, The Tonight Show Starring Johnny Carson, Chad Wackerman Group, Allen Vizzutti.
Leon has Performed In Concert with: Doug Parkinson, Idina Menzel, Shirley Bassey, Dame Kiri Te Kanawa, Sonny Rollins, Sadao Watanabe, Russell Watson, Elaine Paige, Rajaton.
In 1987 Leon immigrated to Australia, and became an Australian Citizen in 2000. Leon has played bass on over 1,000 Recording sessions in Los Angeles, New York, Nashville and Sydney.