Robert Alan Diaz (September 17, 1975 – June 9, 2015)[1][2] known by his stage name Pumpkinhead or P.H., was an American rapper and hip hop artist.

Pumpkinhead started writing rap lyrics at age 10 during his 6th grade language arts class after hearing the song "Nightmares" by Dana Dane.

[3] He also cites his experience of meeting 2Pac and witnessing his ability to write and record songs on the spot as a motivating factor in his emceeing.

The World Famous Beat Junkies featured the remix—featuring guest appearances by Poka Face, Meat Pie, Ocean, What?

In 2013 he appeared on the track "Welcome To The Show" alongside Long Island emcees the Lab Ratz (Dave Z and Lantz).

[6] Pumpkinhead died on June 9, 2015, in a New Jersey hospital, while waiting to undergo a gall stone surgery.