Albert Hoffman, who invented LSD (lysergic acid diethylamide) in 1938 and became the first person to experience an "acid trip" in 1943, has died from a heart attack at the age of 102.
Hoffman initially came up with LSD while attempting to find a circulatory and respiratory stimulant for pharmaceutical company Sandoz – but it didn't seem to help test animals and was abandoned.
W few years later he started work on the drug again and, on 19 April 1943, tried a dose on himself shortly before riding his bicycle home – the event has become known as "Bicycle Day" to LSD fans.
While riding home, Hoffman experienced an LSD "trip" where his field of vision was distorted and he hallucinated.
Hoffman hoped the drug would be used to treat psychological conditions and was disappointed when it was declared illegal.
He continued his career as a noted scientist and has served on the Nobel Prize Committe and been awarded a Fellowship of the World Academy of Sciences.
Hoffman is survived by a wife and three children.