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Mary Ann Horton is an American computer scientist and Usenet pioneer. She was born in 1955 in the United States. She is best known for her work on the Usenet system, which she helped develop in the early 1980s. Horton graduated from the University of California, Berkeley in 1977 with a degree in computer science. She then went on to work at the Lawrence Berkeley National Laboratory, where she worked on the Usenet system. She was also involved in the development of the first version of the Unix operating system. Horton has been recognized for her work in the computer science field, receiving the Grace Murray Hopper Award from the Association for Computing Machinery in 1984. She was also inducted into the Internet Hall of Fame in 2012. Horton is currently retired and living in California. Her net worth is estimated to be around $1 million.

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Age 68 years old
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Mary Ann Horton Net Worth

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Timeline

2003

Horton was one of the first transgender actors to play a transgender role on television. She appeared as Aurora, a business executive, in a public service announcement advertisement for Stonewall Columbus entitled The Boardroom in June 2003.

2002

In 2002, Horton gathered data from 13 of 15 major SRS surgeons to determine incidence, intrinsic prevalence, and average cost of SRS-related surgeries. This data, presented at the Out & Equal Annual Workplace Summit showed that the cost of THB coverage, previously believed to be very high, is actually very low, less than 40 cents per US resident per year. This data, combined with the HRC CEI points, has led to increased coverage of THBs by large employers.

2001

Horton was awarded the "Trailblazer" award by Out & Equal Workplace Advocates in October, 2001 for her work at Lucent and Avaya. The next week, she transitioned, presenting full-time as Mary Ann. Over the next few years, she took appropriate medical steps, and legally changed her name to Mary Ann Horton and her sex to female.

2000

In 2000, Horton joined Avaya, where she was the Sr. Manager of Avaya Corporate Email and Directory. In 2002, Horton joined the UNIX Implementation Engineering group at Bank One, which was purchased by JPMorgan Chase in 2004. Finally fulfilling a lifelong dream, Horton moved from Columbus to San Diego in 2007, joining Sempra Energy's Transmission Grid Operations team.

1992

In 1992, Horton created an internal email package for Bell Labs called EMS (Electronic Messaging System). This package integrated the existing UUCP-based email system with the AT&T "POST" white pages directory and the domain-based email world. She created and led a supported email service for Bell Labs. This system supported many email addressing formats, including those that dynamically queried the POST directory:

1990

The UUCP Zone joined with Lauren Weinstein's Stargate project, which built a pilot project to transmit Usenet over satellite television, to form Stargate Information Systems. The first domain they registered was stargate.com, the second was Horton's employer, att.com. The att.com domain connected to the Internet using dial-up modems until 1990, when Horton implemented Bill Cheswick's firewall architecture to build AT&T's first TCP/IP connection to the Internet with a demonstrably secure firewall.

Horton's 1990 book, Portable C Software became a popular reference for programming in C. It outlined functions and programming techniques that could be reliably used on many different types of computer systems, and which methods were unportable.

In the 1990s, most employer health insurance policies denied coverage for sex reassignment surgery (SRS) or anything related to it. Horton advocated for the inclusion of transgender health benefits (THBs) in these policies. She documented Lucent's coverage of SRS in 2000. and championed the inclusion of points for THBs in the Human Rights Campaign's Corporate Equality Index, which were added in 2005.

1988

Horton continued to lead Usenet until 1988. During this time she promoted rapid growth by arranging news feeds for new sites. Each new site agreed to be the feed for two more new sites as the need arose. This policy contributed to the growth of Usenet to over 5000 sites by 1987. Horton proposed the creation of the Usenet Backbone in February 1983, and has stated that she designed it, and recruited and led the related Backbone cabal, although this has also been attributed to Eugene Spafford. The backbone ensured the reliability and performance of the overall network.

1987

Horton is a transgender woman. Adopting the name Mary Ann in 1987, Horton founded Columbus' first transgender support group, the Crystal Club, in 1989. In 1997, she joined EQUAL Lucent's LGBT employee resource group, and saw the value of being "out" at work, supported by an Equal Opportunity (EO) nondiscrimination policy. At the time, no major company included transgender language in their EO policy. Horton asked for its inclusion in Lucent's policy, and recommended the language "gender identity, characteristics, or expression". As a result, Lucent became the first large company to add transgender-inclusive language to its EO policy in 1997.

1984

At Usenix in January 1984, Horton recruited a group of volunteers to create the UUCP Mapping Project. The project divided the world into geographic regions. A volunteer for each region maintained the region's UUCP connectivity map and posted it regularly to the comp.mail.maps newsgroup. Each site ran Steve Bellovin and Peter Honeyman's pathalias program to create a locally optimized email routing database from this map. Horton worked with Chris Seiwald and Larry Auton to produce the smail program, used this database to route email, using email addresses such as mark@cbosgd.UUCP.

1983

Usenet relied on email for replies, requiring that Usenet links could be used for email. At first, all Usenet and UUCP messages used "bang paths", such as unc!research!ucbvax!mark, as email addresses. Horton guided this email process, including the use of the ARPANET/UUCP gateway, using routed email addresses such as cbosgd!mark@berkeley. These addresses were complex, convoluted, and sometimes ambiguous. When Internet domains were first created in 1983, Horton championed their use, publishing the classic paper "What is a domain?"

1981

In 1981, Horton became a Member of Technical Staff of Bell Labs in Columbus, Ohio. At Bell Labs she brought parts of Berkeley UNIX to UNIX System V, including vi and curses; as part of the work on curses, she developed terminfo as a replacement for termcap (most of this work shipped as part of SVR2). In 1987 she joined the Bell Labs Computation Center to bring official support for Usenet and Email to Bell Labs.

1980

In 1980, Horton brought Usenet's A News system to Berkeley and began to champion its growth from a 10 site network. To Usenet's original dialup UUCP technology, she added support for Berknet and ARPANET, and added a gateway between several popular ARPANET mailing lists and usenet "fa" newsgroups. In 1981, high school student Matt Glickman asked Horton for a spring break project, and the two designed and implemented B News, which offered major performance and user interface improvements needed to keep up with the explosive growth of Usenet traffic volume.

In the mid 1980s, early domain use included .ARPA, .UUCP, .CSNET, and .BITNET as top level domains, representing four major email networks. In January 1986, Horton represented UUCP at a meeting to arrange technical cooperation of these networks. Others were Dan Oberst representing BITNET, Craig Partridge representing CSNET, and Ken Harrenstein, who hosted the meeting on behalf of the ARPANET. Harrenstein convinced the others to support the creation of six top level functionally domains COM, EDU, ORG, NET, GOV, and MIL. Each network was authorized to register domains in COM, EDU, ORG, and NET. This group of registrars was the precursor to the ICANN domain name registry.

1970

Horton was born in Richland, Washington, and raised in the Pacific Northwest. Finding an interest in computer programming in 1970, Horton moved to San Diego County in 1971, and quickly fell in love with California. She graduated from San Dieguito High School in 1973. Earning a BSCS from the University of Southern California in 1976, Horton went on to obtain an MSCS at the University of Wisconsin, and transfer to the University of California at Berkeley in 1978, earning a Ph.D. in Computer Science in 1981.

1955

Mary Ann Horton (born Mark R. Horton, on November 21, 1955), is a Usenet and Internet pioneer. Horton contributed to Berkeley UNIX (BSD), including the vi editor and terminfo database, created the first email attachment tool uuencode, and led the growth of Usenet in the 1980s.