NEW YORK (

TheStreet

) -- Former

Palm

CEO and chief architect of the webOS platform Jon Rubenstein has left

HP

(HPQ) - Get Report

, 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) - Get Report

and

Google

(GOOG) - Get Report

, 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.

>To follow the writer on Twitter, go to

http://twitter.com/Ozoran

.

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