She is known for her work on paranormal phenomena, particularly UFOs and ESP. Her most popular books include:
* "UFO's: A Scientific Appraisal" (1967): A landmark book that presented a scientific perspective on UFO sightings, analyzing evidence and promoting a more open approach to the topic. This book is widely considered to be one of the first to take UFOs seriously.
* "Psychic Discoveries Behind the Iron Curtain" (1970): This book explored the research on psychic phenomena being conducted in the Soviet Union, which at the time was a closed society.
* "Superminds: The Story of ESP" (1974): This book, co-written with her husband Lynn Schroeder, was a groundbreaking exploration of parapsychological research, including telepathy, clairvoyance, precognition, and psychokinesis.
Other books written by Kathleen Ostrander:
* "The ESP Papers" (1977)
* "The Secret of ESP: An Investigation into the Unknown" (1978)
* "The Mystery of the Mind: A Scientific Look at the Paranormal" (1980)
* "The Children of the New Age" (1982): This book explores the burgeoning New Age movement and its focus on spiritual awakening and personal transformation.
* "The Supernatural" (1983)
* "Beyond the Stars: A Cosmic View of UFOs and ESP" (1985)
* "The Final Frontier: A New Look at the Paranormal" (1986)
Kathleen Ostrander has also written several non-fiction books on other subjects, including:
* "The New Age: A Guide to the Future" (1988)
* "The Power of Your Mind" (1990)
* "The Healing Power of the Mind" (1992)
Her books have been translated into many languages and have sold millions of copies worldwide.
Note: While her books are still widely available, the views and perspectives presented in them reflect the scientific and cultural understanding of the time they were written.