SEATTLE - When he walked out of a Seattle park three weeks ago, the mystery man knew this much about himself: He is fluent in several languages and has traveled to other countries.

But he didn't know his name or how he got to Seattle. He's not sure how he came to spend a few days sleeping under a tree in Discovery Park - the city's largest - or how he emerged a bit dizzy but uninjured July 30.

It didn't take long for the power of the Internet to help solve the mystery Thursday.

A reader contacted The Seattle Times Thursday morning, just hours after the newspaper posted a story and photographs of the mystery Jon Doe on its Web site. The reader, David Akast, identified the man as Edward Lighthart, an English teacher he knew in China.

Police have since showed the man his high school yearbook photograph and mentioned the names of people believed to be his parents, but none of that rang a bell, said Seattle detective Tina Drain.

"It appears to be him, but until we know for sure, we can't positively say 'Yes, this is Edward Lighthart,' " she said.

The man still refers to himself as Jon Doe, Drain said. He told the Times the name doesn't sound familiar.

"I guess there's a little bit of relief and at the same time a lot of anxiety," Lighthart told the Times Thursday. "I'm still not sure quite what to make of it all."

Seattle police say the man emerged from the park around 6:15 a.m. on July 30 knowing he didn't live in the Seattle area, but unsure of much else. He flagged down a Metro bus driver, who called police for help.

The man appeared to be well-educated, in reasonable health and in his 50s, according to the police report. He told police he thought he was of German descent.

Randall Snyder, a friend from Columbus, Ohio, said Thursday he recognized a photograph of the man as Lighthart.

The two attended graduate school together at the Union Institute in Cincinnati. An institute spokeswoman said an Edward Lighthart was enrolled in a doctorate program there from March 1993 to June 1994.

The man told the newspaper he went to the University of Wisconsin in the early 1980s, studied at the University of Chicago and Columbia University and lived in Paris, Vienna, Sydney, Shanghai and Bratislava, Slovakia.

The man remembers bits of his professional past, trips to other countries and his teaching, but doesn't recall much personal information, Drain said.

"Little by little, things do come to his mind and he shares that with us," she said.

The man has been at Seattle's Swedish Medical Center as Jon Doe since July 30.