SAN FRANCISCO/NEW YORK: Apple Inc Chief Executive Steve Jobs was at the company's headquarters on Monday, underscoring speculation the pancreatic cancer survivor may have returned to work.

Jobs, who has been on medical leave since January, was seen by a Reuters reporter leaving the Apple campus in Cupertino, California dressed in his trademark black turtleneck and jeans. He walked out chatting with another person before climbing into a black car that then drove off.

Speculation has mounted that Jobs could be back at work soon, fueled in part by a Wall Street Journal article last weekend that said the CEO had a liver transplant two months ago.