The name Fred Klein might resonate differently depending on one’s field of interest. For an art historian, it conjures images of dreamy, impressionistic landscapes painted by a Dutch-born artist and the father of Yves Klein. For a lawyer, it might refer to a seasoned litigator in Chicago. But for those in the fields of psychology, human sexuality, and LGBTQ+ advocacy, Fred Klein represents something far more profound. This Fred Klein—often known as Dr. Fritz Klein—was a revolutionary psychiatrist and sex researcher who changed the way the world understands bisexuality and the very nature of sexual orientation itself.
This article provides a complete overview of the life and career of Dr. Fred Klein, the man behind the groundbreaking Klein Sexual Orientation Grid and a tireless advocate for bisexual visibility. We will explore his journey from a refugee of Nazi Europe to a pioneering force in modern sexology, whose work continues to educate and liberate people around the globe.
Early Life and Education: A Foundation Forged in Exile
Fred Klein was born in Vienna, Austria, in 1932 into an Orthodox Jewish family. This was a time of immense political turmoil in Europe. The rise of Nazism posed a direct and terrifying threat to Jewish families, and when Fred Klein was still a child, his family made the harrowing decision to flee their homeland. They escaped to New York City, seeking refuge and a future free from the persecution that was consuming the continent. This early experience of displacement and the need to rebuild a life from scratch may have contributed to the deep empathy and drive for understanding that would later define his career.
Settling in New York, Klein proved to be a dedicated and brilliant student. He pursued his undergraduate education at Yeshiva University, earning a Bachelor of Arts in 1953. Initially, he followed a more conventional path, obtaining an MBA from Columbia University in 1955. However, his intellectual curiosity and desire to help others led him to the field of medicine. He traveled to Switzerland to study at the prestigious University of Bern, where he spent six years and received his medical degree (MD) in 1971.
The Accidental Activist: Discovering a Void in Research
After completing his medical training, Fred Klein returned to New York and began his career as a board-certified psychiatrist. For the next 30 years, he would practice psychiatry, first in New York and later in San Diego. But it was a personal realization in 1974 that would catapult him from a practicing clinician into the role of a groundbreaking researcher and activist.
As a man who identified as bisexual, Klein was curious about the academic literature on his own sexuality. He went to the New York Public Library, expecting to find a wealth of psychological studies and theories. Instead, he found a void. There was almost nothing written about bisexuality from a scientific or psychological perspective. It was a sexuality that was largely invisible, misunderstood, and dismissed by both the heterosexual mainstream and, at times, the larger gay and lesbian community.
This discovery was a call to action. Fred Klein understood that invisibility in research led to a lack of understanding, validation, and community. He decided to create the community he couldn’t find in the library. He placed a simple advertisement in New York’s Village Voice, a counter-culture newspaper, calling for a meeting of people interested in discussing bisexuality. The response was overwhelming. This first gathering led to the creation of the “Bisexual Forum,” which is recognized as the first bisexual-specific organization in the world.
Groundbreaking Publications and the Klein Grid
The Bisexual Forum provided a vital source of community and data. Fred Klein began rigorously studying the experiences, feelings, and relationships of the people who attended. His research culminated in 1978 with the publication of two significant books. The first, The Bisexual Option, was the world’s first real psychological study of bisexuality. It explored bisexuality not as a confusion or a phase, but as a legitimate and distinct sexual orientation. That same year, he co-authored Man, His Body, His Sex with Alfred Allan Lewis and Eli Bauman, further contributing to the public’s understanding of male sexuality.
Embedded within The Bisexual Option was Klein’s most enduring intellectual legacy: the Klein Sexual Orientation Grid. At the time, the standard for measuring sexual orientation was the Kinsey Scale, developed by Alfred Kinsey in the 1940s. The Kinsey Scale was revolutionary for its time, placing sexuality on a spectrum from 0 (exclusively heterosexual) to 6 (exclusively homosexual). However, Fred Klein recognized that this single-axis scale was too simplistic.
The Klein Grid was a paradigm shift. It proposed that sexual orientation is not a single thing but a multi-faceted and fluid combination of different variables. The Grid measures seven different factors:
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Sexual Attraction (to whom are you attracted?)
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Sexual Behavior (with whom have you had sex?)
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Sexual Fantasies (who appears in your fantasies?)
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Emotional Preference (with whom do you form deep emotional bonds?)
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Social Preference (with whom do you prefer to socialize?)
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Lifestyle (what is the sexual orientation of the people in your daily life?)
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Self-Identification (how do you label yourself?)
Crucially, Klein didn’t just ask about these factors at a single point in time. He asked people to consider their past, their present, and their ideal future. This added a crucial dimension of time and fluidity, acknowledging that a person’s sexuality could evolve over their lifetime. The Klein Grid provided a far richer, more nuanced, and more accurate way for individuals to understand and articulate their own complex identities.
The San Diego Years and The American Institute of Bisexuality
In the 1980s, Fred Klein moved from New York to San Diego. He continued his psychiatric practice but remained deeply committed to his research and advocacy. He started a second Bisexual Forum in his new city and continued to write and publish. In 1986, he published Bisexualities: Theory and Research, and in 2001, he offered insight into a little-discussed topic with Bisexual and Gay Husbands: Their Stories, Their Words. He also tried his hand at fiction, publishing the novel Life, Sex and the Pursuit of Happiness in 2005.
One of his most significant achievements in this later period was the founding of the Journal of Bisexuality in 2000. As a peer-reviewed academic journal, it provided a formal, respected platform for scholars from around the world to publish research, theories, and essays on bisexuality. Klein served as its principal editor, ensuring the highest standards of scholarship until his death.
To ensure that the work of promoting bisexual research and education would continue long after he was gone, Fred Klein founded the American Institute of Bisexuality (AIB) in 1998. Also known as The Bi Foundation, the AIB’s mission is to encourage, support, and assist research and education about bisexuality. It provides research grants, promotes bi-inclusive education, and works to foster bi culture and community. Today, the AIB continues Dr. Klein’s vital work, sponsoring projects and maintaining resources like Bi.org, a major online hub for the bisexual community.
Legacy and Passing
Dr. Fred Klein passed away unexpectedly on May 24, 2006, at his home in San Diego at the age of 73. He had been diagnosed with cancer and had undergone surgery, but ultimately died of cardiac arrest. He was survived by his life partner, Tom Reise, and in a final act of generosity to science, he donated his body to medical research.
His death marked the end of an era, but the impact of his life’s work is immeasurable. Fred Klein was a true pioneer. At a time when bisexuality was largely invisible, he dared to say, “We exist, and our existence is complex and worthy of study.” He gave a community a language and a framework to understand itself.
The Klein Sexual Orientation Grid remains a vital tool for therapists, educators, and individuals exploring their own identities. The American Institute of Bisexuality stands as a living monument to his vision, continuing to fund the research and education he held so dear. Dr. Fred Klein transformed the landscape of sexology, moving the conversation from a binary view of sexuality to one that embraces the beautiful, fluid, and multifaceted reality of human experience.
Frequently Asked Questions about Fred Klein
1. What is the main difference between the Kinsey Scale and the Klein Grid?
The Kinsey Scale measures sexual orientation on a single spectrum from 0 (exclusively heterosexual) to 6 (exclusively homosexual). The Klein Grid, created by Fred Klein, is a multi-dimensional tool that measures seven different factors of sexuality (such as attraction, behavior, fantasies, and emotional preference) across three different time periods (past, present, and ideal future). It presents a far more complex and fluid picture of a person’s sexuality.
2. Why did Fred Klein create the Klein Sexual Orientation Grid?
As a bisexual psychiatrist, Fred Klein found that the existing tools, like the Kinsey Scale, did not accurately capture his own experience or the experiences of others in the bisexual community. He created the Grid to account for the complexity and fluidity of sexual orientation, showing that it is made up of many different components that can change over time.
3. What was the Bisexual Forum?
The Bisexual Forum was the first organization in the world created specifically for bisexual people. Fred Klein founded it in New York in 1974 by placing an ad in the Village Voice and inviting people to a meeting. It served as a support group and a source of research participants for his studies.
4. Did Fred Klein write any books?
Yes, Fred Klein wrote several important books. His most famous work is The Bisexual Option (1978), which was the first major psychological study of bisexuality. He also wrote Bisexualities: Theory and Research (1986), Bisexual and Gay Husbands: Their Stories, Their Words (2001), and a novel titled Life, Sex and the Pursuit of Happiness (2005) .
5. What is the American Institute of Bisexuality (AIB)?
The AIB, also known as The Bi Foundation, is an organization founded by Fred Klein in 1998. Its mission is to encourage, support, and assist research and education about bisexuality. It continues Dr. Klein’s legacy by funding research and promoting bisexual visibility and community.
6. Was “Fritz” his real name?
Yes, Dr. Fred Klein was widely known as “Fritz.” Many biographical sources and his own organization, the American Institute of Bisexuality, refer to him as Dr. Fred “Fritz” Klein. It was a common nickname for Friedrich or Frederick in German-speaking cultures.
7. Is the Fred Klein who was a painter the same person as the sex researcher?
No. This is a common point of confusion. The Fred Klein who was a Dutch painter (1898-1990) and father of Yves Klein is a different person from Dr. Fred Klein (1932-2006), the Austrian-born American psychiatrist and sex researcher.