The late Ann Shulgin, co-author of two seminal books on psychedelic drugs in psychotherapy

has died at the age of 91, her husband also passed away

Her daughter, Wendy Tucker, said that Shulgin had been ill with chronic obstructive pulmonary disease

Her death occurred Saturday at "the farm," the sprawling San Francisco Bay Area residence she shared

 with her chemist husband until his death in 2014. She was surrounded by loved ones, Tucker said

She has played a crucial role in introducing psychedelics to the therapeutic community

allowing them to be used for self-exploration and healing through her tireless advocacy.

Ann Shulgin, née Laura Ann Gotlieb, was born in Wellington, New Zealand, in 1931 

A New Zealander, Gwen Ormiston, was her mother, and an American, Bernard Gotlieb, was her father

Ann and Sasha were married in 1981 and had three children together