I write quite a bit, and occasionally these writings have turned into useful publications. I have written two technical books:”The vi Users Handbook” and “Portable C Software”, and am working a memoir.


Trailblazer: My Quest to bring Transgender Equality to Corporate America

“Who am I, really?” Mary Ann Horton’s search for her true self is revealed in this intimate memoir that details her transition from male to female. Aided by her indomitable spirit, she struggles through a maze of social, medical, and legal rights. As she peels back the layers and redefines her relationships, she becomes a powerful force for the acceptance of transgender benefits and rights at Lucent Technologies, blazing the trail for corporate America to follow.

To be released October 2022.

Portable C Software

This 1990 book was the first published in my own name. It was a reference book showing software developers how to write their programs to be easily ported to different computer systems, and which functions were available on which systems. It is now considered a rare book, with a new copy on Amazon going for over $3,000, and used copies at $100 and up.

The vi Users Handbook

Tech writer Morris Bolsky contacted me in 1984 to help write a “quick guide” to the UNIX vi editor. We agreed to co-author it. I worked with him, providing the detailed content, and he did the editing and publication work. I was shocked to see that he listed himself as the sole author.


What is a Domain?

I wrote this paper in 1984 to publicize the concept of Internet domains. At the time the network landscape was flat, with computer names defined by the path to get an email message to them: ucbvax!research!unc!smb. This, plus the eventual availability of Internet domains through the UUCP Project, helped get everyone speaking the same user@domain.com language. It was published as: (Horton, M. What is a Domain? Proceedings of the Summer 1984 USENIX Conference, USENIX Association, Berkeley, CA, June 1984, pp. 368–372.)

Internet Standard RFC 976

Having a written standard for email formatting of messages sent over the UUCP network helped resolve differences in implementations and make it practical to use domain name syntax in UUCP email.

Internet Standard RFC 850

Usenet was one of the first Social Media networks. This document was the standard format for Usenet messages.

Transgender Demographics and Health Benefit Costs

In 2001 I performed research into how many transgender people were seeking surgeries, and what it would cost. The resulting two papers tell us


In 2004, in response to the passage of Ohio Issue 4, I sat down with my friends Lisa and Bill Koontz to write a poem about gay marriage: “How the Grinch Stole Marriage“.


Transgender 101

I’ve given this 90 minute workshop in man workplaces, churches, and other settings.

Transgender Issues in the Workplace

This advanced talk presents simple solutions employers can implement to help transgender workers be fully productive in the workplace.

The Cost of Transgender Health Benefits

This 90 minute workshop was presented at Out & Equal from about 2004 through 2008. It takes the dry statistical information from my Transgender Health Benefits papers and present is in a fun, interactive format. Here is the Powerpoint from the workshop.