Gerald Christopher, a 45-year-old personal trainer and business owner from St. David's, disappeared early on June 1st.
Radnor Township police spoke with family and friends who said he was unusually quiet and left home with no wallet or phone.
"Mr. Christopher was acting irrational prior to the days leaving his home, but nothing that would amount to psychiatric or mental health emergency," said Sgt. Andrew Block of the Radnor Twp. Police Dept.
Police went on to say that Christopher he may also be operating a black and yellow sport racing motorcycle.
Investigators don't suspect foul play.
Anyone with more information should contact Radnor Police at 610-688-0503.