- Bassist of the progressive metal band Dream Theater.
- Is of Korean decent.
- Studied violin at age five.
- Co-founding member of Dream Theater.
- Didn't take up bass guitar until age 16, but his background with the violin helped him to learn the bass quickly.
- Attended Berklee College of Music in Boston with John Petrucci, where they met future band mate Mike Portnoy.
- Although born in Chicago, he grew up on Long Island near John Petrucci.
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