There are several artists with this name, for the British soul/pop/new wave band fronted by Jim Diamond see Ph.D..
1) PHD (Poet & Hot Day) is a collaboration between Blaq Poet and hip-hop producer Hot Day. Their collaboration spawned a single album, Without Warning, which was released on August 31, 1991 on Tuff City Records. The duo released only two singles: I'm Flippin' and Pandemonium. The album isn't well known, but Poet's lyrical flow and content gave the album its share of publicity. The album has one guest feature by a young Cormega in the track, Set It Off.
2) There is also drum & bass producer and DJ Patrick Henry named PHD from Aylesbury, UK, see links in the sources.
3) The PhD's Band from Pittsburgh, CA is named PHDs, because all original members had Pittsburg High Diplomas. They offer a blend of contemporary R&B, Latin, oldies, standards and jazz.
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