Steve Jobs looked gaunt back in 2008
Apple boss Steve Jobs is back at work following six months of medical leave, although he will work from home for part of the week, the company says.
His return to the office follows months of speculation about his health and his future at the firm he founded more than 30 years ago.
The 54-year-old had a liver transplant while on leave, reports said.
He was behind the Macintosh computer, iPhone and iPod, which helped to revive Apple's fortunes.
"Steve is back to work," an Apple spokesman said.
"He's currently at Apple a few days a week and working from home the remaining days. We are very glad to have him back."
Mr Jobs was diagnosed with pancreatic cancer in 2004.
The company's share price fell in January this year, when he announced he was taking leave because of a hormone imbalance.
Investors are likely to welcome Mr Jobs' return to the company's headquarters in Cupertino, California.
"In many ways he's irreplaceable," Ashok Kumar, of financial analysts Collins Stewart, told Reuters news agency.
"Having him back brings the halo back to the company."