Question: Who appeared in the 1979 Italian-American science fiction horror film, The Visitor, who also is an American author, attorney, and former libertarian radio host?

Context paragraphs:
William Schoell: William Schoell (pronounced "shoal") is an American author, biographer and film historian, born in Manhattan in 1951 and educated in Vermont, earning a B.A. from Castleton State College.  He has written several horror and science fiction novels, such as "Late at Night" (1986) and "Saurian" (1988).  He was the author of "Hidden Horrors," a column in the now defunct horror magazine "The Scream Factory", as well as a contributor of articles and reviews to periodicals including "Writer", "Writer's Digest", "Paris Notes", "Off Duty", and "BBC Music".  He was also a talk show radio host and producer.  More recently, he has published books that deal with film, and biographies, some of which were written together with Hollywood biographer Lawrence J. Quirk, his domestic partner.  His play "Joe and Janice" premiered at the American Theater of Actors in 2000.  He writes a popular blog on movies called Great Old Movies.  Prominent in the Gay Rights Movement in the 1970s, he now has a blog called "Ask Gay "Dr." Bill," which answers questions about gay life and the LGBT community.

L. Neil Smith: Lester Neil Smith III (born May 12, 1946), better known as L. Neil Smith, is an American libertarian science fiction author and political activist.  His works include the trilogy of Lando Calrissian novels: "Lando Calrissian and the Mindharp of Sharu" (1983), "Lando Calrissian and the Flamewind of Oseon" (1983), "Lando Calrissian and the Starcave of ThonBoka" (1983), and the Omnibus edition "The Lando Calrissian Adventures".  He also wrote the novels "Pallas", "The Forge of the Elders", and "The Probability Broach", each of which won the Libertarian Futurist Society's annual Prometheus Award for best libertarian science fiction novel.  In 2016, Smith received a Special Award for Lifetime Achievement from the Libertarian Futurist Society.

The Visitor (1979 film): The Visitor is a 1979 Italian-American science fiction horror film directed by Giulio Paradisi (credited as Michael J. Paradise) and based on a story by the Egypt-born Italian writer and producer Ovidio G. Assonitis.  Unlike many of its contemporaries, features a cast of well-established stars including John Huston, Shelley Winters, Mel Ferrer, Glenn Ford and Sam Peckinpah with supporting appearances by Neal Boortz, Steve Somers, and Kareem Abdul-Jabbar.  It was filmed on location in Atlanta, Georgia and at Cinecittà Studios in Rome.  It has garnered a cult following over the years.

Neal Boortz: Neal A Boortz, Jr. (born April 6, 1945) is an American author, attorney, and former Libertarian radio host.  His nationally syndicated talk show, "The Neal Boortz Show", which ended in 2013, was carried throughout the United States.  It was ranked seventh in overall listeners, with more than 4.25 million per week.  The content of the show included politics, current events, social issues, and topics of interest, which Boortz discussed with callers, correspondents and guests.  Boortz touched on many controversial topics and referred to himself as an "equal opportunity offender."

Richard Matheson: Richard Burton Matheson (February 20, 1926 – June 23, 2013) was an American author and screenwriter, primarily in the fantasy, horror, and science fiction genres.  He is best known as the author of "I Am Legend", a 1954 science fiction horror vampire novel that has been adapted for the screen four times, as well as the movie "Somewhere In Time" for which Matheson wrote the screenplay, based on his novel "Bid Time Return".  Matheson also wrote 16 television episodes of "The Twilight Zone" for Rod Serling, including "Nightmare at 20,000 Feet" and "Steel".

Prometheus Award: The Prometheus Award is an award for libertarian science fiction novels given annually by the Libertarian Futurist Society, which also publishes the quarterly journal "Prometheus".  L. Neil Smith established the award in 1979, but it was not awarded regularly until the newly founded Libertarian Futurist Society revived it in 1982.  The Society created a Hall of Fame Award (for classic works of libertarian science fiction, not necessarily novels) in 1983, and also presents occasional one-off awards.

Invasion of the Body Snatchers: Invasion of the Body Snatchers is a 1956 American science fiction horror film produced by Walter Wanger, directed by Don Siegel, that stars Kevin McCarthy and Dana Wynter.  The black and white film, shot in Superscope, was partially done in a film noir style.  Daniel Mainwaring adapted the screenplay from Jack Finney's 1954 science fiction novel "The Body Snatchers".  The film was released by Allied Artists Pictures on a double bill with the British science fiction film "The Atomic Man".

Leviathan (1989 film): Leviathan is a 1989 Italian-American science fiction horror film directed by George P. Cosmatos and written by David Webb Peoples and Jeb Stuart.  It stars Peter Weller, Richard Crenna, Ernie Hudson, and Daniel Stern as the crew of an underwater geological facility stalked and killed by a hideous mutant creature.  Its creature effects were designed by Academy Award-winning special effects artist Stan Winston.

Tentacles (film): Tentacles (Italian title: "Tentacoli") is a 1977 Italian-American horror film directed by Ovidio G. Assonitis and starring John Huston, Shelley Winters, Bo Hopkins and Henry Fonda.  Although the film was intended to cash in on the success of "Jaws", "Tentacles" also bears numerous resemblances to the 1955 science fiction horror film "It Came from Beneath the Sea".

Invaders from Mars (1986 film): Invaders from Mars is a 1986 science fiction horror film, directed by Tobe Hooper from a screenplay by Dan O'Bannon and Don Jakoby.  It is a remake of the 1953 science fiction film "Invaders from Mars", and is a reworking of that film's screenplay by Richard Blake from an original story by John Tucker Battle.  Its production was instigated by Wade Williams, millionaire exhibitor, science fiction film fan and sometime writer-producer-director, who had reissued the original film in 1978 after purchasing the copyright to the property.  Elaborate creature and visual effects for this remake were supplied by Stan Winston and John Dykstra.

Supporting paragraphs: The Visitor (1979 film) Neal Boortz
Answer: Neal A Boortz, Jr.