Trailblazer

“This is a great book about an amazing journey of a woman who went through hell to become the person she is today.”

– Monica Helms, creator of the transgender flag.

In the 1990s, it was expected that a transgender woman would learn to pass, quit her job, pay for her surgery herself, move to another city, and start over as a secretary. That was the world Mary Ann Horton inherited when she began her transition and the world she decided to change.

In October 1997, Horton persuaded Lucent Technologies to become the first Fortune 500 company in history to add transgender-inclusive language to its corporate nondiscrimination policy. The five words she proposed “gender identity, characteristics, or expression” became the template that Apple, Avaya, IBM, Xerox, Chase, and eventually 95% of Fortune 500 companies would follow. The research she conducted proved that gender affirming care coverage costs companies less than 40 cents per insured per year, essentially nothing. That research shaped the Human Rights Campaign’s Corporate Equality Index criteria that corporations still use today.

Trailblazer: Lighting the Path for Transgender Equality in Corporate America is the firsthand account of how one person changed what was possible for transgender workers across the entire corporate world told from the inside, by the woman who did it.

Mary Ann Horton is not only a transgender activist. She is one of the foundational architects of the modern internet. At UC Berkeley in 1981, she created uuencode, the first binary email attachment tool. She led Usenet from a 10-site network to over 5,000 sites worldwide. She was a driving force behind the adoption of the user@domain.com email format, helping standardize how the world communicates. Her 1981 PhD dissertation created Babel, the first real-time code error detection system, the direct forerunner of tools like Microsoft Visual Studio and Eclipse.

For HR professionals navigating the current political landscape, for ERG leaders defending the inclusion commitments their organizations built on her foundation, for university faculty teaching technology ethics or gender studies, and for anyone who has ever asked whether one person can genuinely change the world, Trailblazer is the answer.

“Can one person change the world? Yes. And you can too.” — Mary Ann Horton

Awards and Recognition

The BookFest Awards Spring 2024

• Nonfiction — Professional Memoir: First Place
• Nonfiction — LGBTQ+: First Place
• Nonfiction — Business Leadership, Harassment and Discrimination: First Place

International Book Awards 2024

• LGBTQ+ Nonfiction

Recommended by Monica Helms (creator of the transgender flag), Brian McNaught (40-year colleague and corporate diversity consultant), and the International Memoir Writers Association.

About Mary Ann Horton

Dr. Mary Ann Horton changed corporate America for transgender workers in 1997 when she persuaded Lucent Technologies to become the first Fortune 500 company to add transgender-inclusive language to its nondiscrimination policy. The five words she proposed “gender identity, characteristics, or expression” became the template that 95% of Fortune 500 companies now follow.

She is also one of the foundational architects of the modern internet: inventor of the email attachment at UC Berkeley in 1981, leader of Usenet’s early growth, a driving force behind the adoption of the user@domain.com email format, and creator of Babel, the 1981 real-time code error detection system that preceded Microsoft Visual Studio and Eclipse.

She received the Out and Equal Workplace Associates Trailblazer Award in 2001 and the 2025 Clarence E. Anderson Peace and Justice Award from SoCal Lutherans. She is an assisting minister at First Lutheran Church of San Diego.

Featured in VICE, The Daily Beast, Google Arts and Culture, Salon, Diversity Factor, and SHRM.