Jon Rubenstein, the evangelist behind the webOS platform, completes a two-year commitment with HP.

NEW YORK (TheStreet) -- Former Palm CEO and chief architect of the webOS platform Jon Rubenstein has left HP(:HPQ), the company confirmed.

Rubenstein joined HP after Palm's acquisition and is departing after fulfilling a commitment to stay 12 to 24 months. He is leaving the company after HP ditched the webOS platform in August.

While webOS was HP's attempt at breaking into the smartphone and tablet market where it has lagged behind rivals Apple(:AAPL) and Google(:GOOG), the platform failed to gain traction with its TouchPad device.

After HP scrapped webOS, Rubenstein--a former Apple exec-- was moved to a new role within the company's Personal Systems Group.

Shares of HP fell 0.5% to $27.86 in afternoon trading on Friday.

--Written by Olivia Oran in New York.

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