William Hart

The Delfonics were an American R&B/soul vocal group from Philadelphia. The Delfonics were most popular in the late 1960s and early 1970s. Their most notable hits include "La-La ", "Didn't I ", "Break Your Promise", "I'm Sorry", and "Ready or Not Here I Come ". Their hit songs were primarily written by lead vocalist and founding member William "Poogie" Hart, and arranger and producer Thom Bell. Wilbert Hart is the last surviving founding member.

Biography summary from English Wikipedia, photograph via Wikimedia Commons.