Matthew Greene, disappeared Mammoth Lakes, California, July 16 2013
Matthew Greene, 39, was a high school mathematics teacher in Nazareth, Pennsylvania, and lived in Bethlehem. He was a very experienced hiker and outdoorsman. For example, he was in Papua New Guinea for three years (while serving in the Peace Corps).
Greene arrived in the area of the Eastern Sierra Mountains on June 27, 2013 to climb with friends, but when his Suburau car broke down they continued on while he stayed behind at a campground near Mammoth Lakes to wait for repairs called Shady Rest.
The last contact was on July 16 when he called his parents and the car repair shop to check on progress and exchanged text messages with friends.
His friends returned to the camp site on July 17 and he was nowhere to be seen. They then discovered that his car had been repaired but he never picked it up and he hadn't returned to the Shady Rest Campground for over a week. The Mammoth Lake Police Department was informed.
At the camp site authorities found some of his gear missing and a guide book with pages torn out of it. Friends said he often tore out the pages for hikes he wanted to go on, and when he completed them he would but them back in his book. In this case the pages were from the Minerat area, including Mt Ritter and Mt Banner but Greene didn't sign his name on either summit's log.
Greene was first reported missing July 29 to the Mammoth Lakes Police Department. He was last known to have been camping at the Shady Rest Camp Ground while his was waiting for his car to be repaired.
Several of Greene's friends flew to California and canvassed bus drivers, store owners, librarians and others in Mammoth Lakes, posted fliers at trailheads, checked summit registers and spent several days in the back country looking for clues. The search has gone airborne, too, with a helicopter flying over the rugged terrain and one of Greene's friends shooting high-resolution video from a private plane. California search-and-rescue personnel have also volunteered their time.
Despite this extensive search, no trace of Matthew was found. There were theories he had been kidnapped on the way to the Minerat area whilst hitch hiking or had a run-in with the owners of his car's repair shop. Given he was such an experienced outdoorsman, it seems strange that he could have disappeared as a result of natural causes.