An award-winning Microsoft researcher has been missing since he set off on a solo sail trip on Sunday.

Jim Gray, who works in Microsoft’s Research Center in San Francisco, left alone on his 40-foot sailing yacht Tenacious sometime on Sunday morning and was expected back in the evening that same day, the U.S. Coast Guard said in a statement Monday. However, the 63-year-old Gray had not returned by Monday night.

The Coast Guard said a search for Gray started Sunday night after his wife reported him missing. The overnight search involved an airplane, helicopter, patrol boat and a life boat and continued during the day on Monday, with three additional patrol boats and a utility boat, the Coast Guard said. However, no signs of Gray or his yacht have been found.

Source: News.com