Mary Gerritsen, Ph.D. is an independent biotechnology consultant who has been growing orchids (mostly species) on and off for more than 30 years, and since relocating to the San Francisco Bay area in 1997 started to a collection of small cool growing miniature species such as Masdevallias, Porroglossums, Lepanthes and other assorted tiny gems. She also has a second intermediate greenhouse, filled with larger species such as Angraecoids, Dendrobiums, Oncidiums, Laelias, Phalaenopsis and Bulbophyllums. She loves to see orchids growing in situ, and has made it her mission over the last few years to see and photograph as many as possible.

Masdevalia veitchiana

She is the co-author of several botanical books: Masdevallias, Gems of the Orchid World; Calochortus, Mariposa Lilies and their Relatives; A Compendium of Miniature Orchid Species; A Bay Area Guide to Orchids and their Culture; and the American Orchid Society Guide to Orchid and their Culture, with fellow San Francisco Orchid Society Member and well known photographer, Ron Parsons.

Mary is the chief financial officer of the Orchid Conservation Alliance, serves on the board of directors of Orchid Digest, and is a past president of the San Francisco and the Peninsula Orchid Societies.