In a Houston Penthouse With David Cassidy: Doing The "Shrimp Shuffle" in 1975

Promoting his first post-Partridge solo album, I was the only one in the room who didn't ask about "The Partridge Family." He was impressed.

He was 25 years old, which is astounding to realize when you think about the worldwide fame he had accrued in the four years that millions of TV sets and turntables were tuned to all things Keith Par…