Christopher Franz, 48, of the Titusville section of Hopewell Township, has been missing since January 6th.
Police say Franz was last seen at his sister's house in Solebury, Pa. that night.
His family members tell police that Franz suffers from bipolar disorder but is not considered violent or dangerous.
Franz is described as being 5'10" tall weighing 160 lbs. with brown hair and eyes. He was last seen wearing blue jeans, a white shirt, and brown boots.
Anyone with information is asked to call the Hopewell Township Police Department at (609) 737-3100.