Keith Henson

In early 2015, Henson created the Google group Power Satellite Economics where various concerned citizens and experts from various fields can discuss the complexities and benefits of power satellites and related work.

Henson visited Reaction Engines in the UK twice: in 2012 on the way back from a power satellite presentation in Germany ("Economic feedback for low-cost solar energy from space") and in 2016 when he gave a two-hour presentation to the engineering department of Reaction Engines. The latter, plus other, later discussions set the rate of expansion for producing Skylon rocket planes used in the power satellite business cases.

The Electronic Frontier Foundation, as well as Henson's supporters on the USENET newsgroup alt.religion.scientology, say that his trial was biased, unfair and a mockery of justice. Henson was prohibited by the trial judge, for example, from arguing that copying documents for the purpose of criticism is fair use. Henson's location as of February 3, 2007 was the Yavapai Detention Center in Prescott, Arizona, awaiting possible extradition to Riverside County, California. At the "initial appearance" hearing on February 5, 2007, Henson stated through counsel that he was fighting extradition and requested release.

Judge Lindberg set a court date for March 5, 2007 in the Prescott Justice Court and set release at $7,500 cash or bond, with standard conditions. Henson's release on bond was secured. In spite of these distractions, Henson finished a space elevator presentation for a European Space Agency conference. The paper was presented by proxy on February 28, 2007.

The extradition hearing for Henson was postponed to May 8, 2007, at the request of Henson's attorney and the County attorney. At his release from jail, Henson was handed paper work from Riverside County, including a warrant from September 15, 2000. At the May 8, 2007 hearing, Henson was presented with an arrest warrant, and returned to jail. In 2007, Henson was jailed in Riverside, California for "using threats of force to interfere with another's exercise of civil rights". He was released in early September 2007.

From 2007 on, Henson worked independently and with others on the problems of global energy supply and affordable cost, particularly on power satellites for space-based solar power. There he was particularly concerned with launch cost, system mass, waste heat, heat radiators, and economics.

Henson stated his belief that if he went to prison, his life would be placed in jeopardy. Rather than serve his sentence, Henson chose to enter Canada and apply for political asylum. Henson lived quietly in Brantford for three years while he awaited the decision. His request was ultimately denied and, in 2005, he was ordered to present himself for deportation and transfer to US authorities. Instead, Henson fled to the United States and later presented himself to the Canadian consulate in Detroit. Then he settled in Prescott, Arizona where he remained for two years until his arrest in 2007 by Arizona authorities.

Henson is one of the focal points of the ongoing struggle between the Church of Scientology and its critics, often referred to as Scientology versus the Internet. Henson entered the Scientology conflict when it was at its most heated in the mid-1990s. In 1996, many of Scientology's secret writings were released onto the Internet, and the Church of Scientology embarked on a massive worldwide campaign to keep them from being spread to the general public. Henson examined these writings, entitled New Era Dianetics (NOTS), and from his examination of these secret documents, said that Scientology was committing medical fraud. The NOTS documents, he said, contained detailed instructions for the treatment of physical ailments and illnesses through the use of Scientology practices. The Supreme Court decision in 1971 had declared that Scientology's writings were meant for "purely spiritual" purposes, and all Scientology books published since then have included disclaimers stating that Scientology's E-meter device "does nothing" and does not cure any physical ailments. The NOTS procedures, Henson claimed, were a violation of this decision. To prove his claim, Henson posted two pages from the NOTS documents onto the Usenet newsgroup alt.religion.scientology.

Henson's wife, Arel Lucas, was credited by Douglas Hofstadter in Metamagical Themas for suggesting that the study of memes be called memetics. Henson wrote two articles on memes in 1987, one published in Analog and the other, Memes, Meta Memes and Politics, circulated on the internet before being printed.

In 1985, Henson, his wife, and their two-year-old daughter signed up with Alcor for cryonic suspension after being convinced by Eric Drexler that nanotechnology provided a method to make it work. Henson's daughter is the youngest member to sign up to Alcor. Following the Dora Kent problems, Henson became increasingly active with Alcor. After Alcor froze their chief surgeon, he learned enough surgery to put several cryonics patients on cardiac bypass. He also wrote a column for Alcor's magazine, Cryonics, for a few years. Henson persuaded Timothy Leary to become an Alcor member, though Leary eventually dropped his membership.

In 1980, Henson testified before the United States Congress when the L5 Society successfully opposed the Moon Treaty. The society was represented by Leigh Ratiner. The experience eventually became an article, Star Laws, jointly written by Henson and Arel Lucas and published in Reason Magazine. Timothy Leary was influenced by Henson's work-and credited him in publications when he referred to Space Migration and Life Extension.

Henson co-wrote papers for three Space Manufacturing conferences at Princeton. The 1977 and 1979 papers were co-authored with Eric Drexler. Patents were issued on both subjects—vapor phase fabrication and space radiators.

In 1974, Henson's occasional rock climbing partner, physicist Dr. Dan Jones, introduced him to the space colonization work of Dr. Gerard K. O'Neill from Princeton University. To promote these ideas, Henson and Meinel founded the L5 Society in 1975.

After graduation, Henson went to work for Burr-Brown Research, now merged into Texas Instruments, in Tucson, Arizona. He worked on extremely low distortion quadrature oscillators and nonlinear function modules (multipliers, vector adders and root-mean-square). His first patent was a design for a 4-quadrant log-antilog multiplier. He claims to have been fired from an unnamed company in 1972 for refusing to certify an electronic module for a nuclear power plant that failed to meet a required MTBF specification. Henson set up his own company, Analog Precision Inc., to produce specialized computer interface equipment and related industrial control devices.

Henson married his first wife, Carolyn Meinel, in 1967 and divorced in 1981.

Henson was known at the University of Arizona as one of the founders of the Druid Student Center, where a campus humor newspaper, The Frumious Bandersnatch was published in the late 1960s. He cited an incident while he was a student as a good example of memetic replication. When someone asked him to fill in a form which required him to disclose his religious affiliations he wrote Druid. His prank was soon noticed by other students and before long almost 20% of the student body had registered themselves as Reform Druids, Orthodox Druids, Members of the Church of the nth Druid, Zen Druids, Latter-Day Druids and so on. The university was forced to remove the religious affiliation question.

Howard Keith Henson (born 1942) is an American electrical engineer and writer. Henson writes on subjects including space engineering, space law (Moon treaty), memetics, cryonics, evolutionary psychology, and the physical limitations of Transhumanism. In 1975, Henson founded the L5 Society with his then-wife Carolyn Meinel to promote space colonization. In 1987 the L5 Society merged with the National Space Institute to form the National Space Society.

Henson was raised in a military family and he attended seven schools before 7th grade. His father, Lt. Col. Howard W. Henson (1909–2001), was a decorated (Bronze Star and Legion of Merit) US Army officer who spent much of his career in Army Intelligence. The science-fiction author Robert A. Heinlein heavily influenced his early life. Henson graduated from Prescott High School shortly after his father retired, before attending the University of Arizona and receiving a degree in electrical engineering.