Jon Rubinstein, Hewlett-Packard (NYSE:HPQ)'s chief evangelist for WebOS and one of Silicon Valley's most renowned engineers, has left the company, HP confirmed Friday.Rubinstein, known as the father of the Apple (NSDQ:AAPL) iPod, started his career at HP in the mid-1980s and was CEO of Palm when HP acquired the company for $1.2 billion in July 2010. When he rejoined HP, Rubinstein made a 12- to 24-month commitment to stay at the company, and he has helped deliver a number of key products since then, an HP spokesperson told CRN.

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