No, Mike Portnoy's father's name was Howard. He died of cancer.
Reference an interview of Mike Portnoy:
http://www.songfacts.com/blog/interviews/mike_portnoy_of_dream_theater/
Search that web page for "my dad".
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Gary Portnoy was born on June 8, 1956.
Gary Portnoy performed the song, "Where Everybody Knows Your Name." Gary Portnoy and Judy Hart Angelo were the authors.
Gary Portnoy.
Written by Gary Portnoy and Judy Hart Angelo
Mike Portnoy has played in a lot of bands such as Liquid Tension Experiment, Transatlantic and Yellow Matter Custard (a Beatles Cover Band), but is most known for founding Dream Theater with John Petrucci and John Muyng in 1985, which he left September 8th. He is currently touring with Avenged Sevenfold following the passing of their original drummer James "The Rev" Sullivan. He also played the drums on Avenged Sevenfold's latest album, "Nightmare".