Ford Pines

Dr. Stanford "Ford" Filbrick Pines, Ph.D. (born late 1940s – early 1950s in Glass Shard Beach, New Jersey), also known as The Author, is a mysterious paranormal investigator who came to Gravity Falls, Oregon, to study the huge concentration of supernatural activity in and around the town. After spending years cataloging his research in a series of journals, he disappeared into an alternate dimension, his writings the only evidence of his existence.

His identity and whereabouts were a central mystery of the series until the middle of the show's second season, when he was revealed to be Stan Pines' long-lost twin brother who vanished into an alternate universe after a falling out with his brother Stanley Pines aka Grunkle Stan caused him to stumble into the universe portal.