Robert "Tim" Scully (born August 27, 1944) is an American computer engineer, best known in the psychedelic underground for his work in the production of LSD from 1966 to 1969, for which he was indicted in 1973 and convicted in 1974.

In eighth grade, he won honorable mention in the 1958 Bay Area Science Fair for designing and building a small computer.

1965: Apprentice to Owsley Scully knew the government would move quickly to suppress LSD distribution, and he wanted to obtain as much of the main precursor chemical, lysergic acid, as possible.

1966: Point Richmond lab and "White Lightning" Owsley took Scully to the Watts Acid Test on February 12, 1966, and they built electronic equipment for the Grateful Dead until late spring 1966.

The search was eventually ruled illegal, but Scully decided to retire from clandestine chemistry and pursue electronic design instead.

In early 1973 Billy Hitchcock was threatened with 24 years in prison for tax evasion if he didn't help the government convict the prime movers of the LSD cartel.

Scully's appeals ran out in late 1976, so he sold his stock in his company and began serving prison time in early 1977.

Scully spent his time in prison helping design and build biofeedback and interface systems for the non-vocal handicapped.

As the founder of Pacific Bionic Systems (reformed in 1980 as Mendocino Microcomputers, with Scully continuing as president and chairman), he consulted with such diverse entities as the Esalen Institute and the Children's Television Workshop on database management and computer games.

He has retired from his career with Autodesk as an AutoCAD dealer (1983-1987), consultant (1987-2000) and senior software developer (2000-2005) and is currently researching a book on the underground history of LSD.