Jon Rubinstein, the former Apple exec who took over handheld maker Palm and moved with it to Hewlett-Packard in a 2010 acquisition, has left HP effective today, according to “AllThingsD.”

Rubinstein is said to have no immediate plans, and had completed a 12-24 month commitment to stay with HP after the acquisition. “Jon has fulfilled his commitment and we wish him well,” HP spokeswoman Mylene Mangalindan said.

In a brief comment to “AllThingsD,” Rubinstein said, “I am going to take a well deserved break after four and a half years of developing webOS.”

Rubenstein, who left Apple in 2006, served as the head of the Mac hardware engineering division before becoming senior vice president of the company’s iPod music player division. For more, go to . Read more at .