Question: When was the American actor and producer born who was lead actor in the television series "MacGyver" (1985–1992) and also present in Season four of "Stargate SG-1"?

Context paragraphs:
Evan Lorne: Major Evan Lorne, USAF is a fictional character in the Canadian–American Sci-Fi Channel television series "Stargate SG-1" and "Stargate Atlantis", two military science fiction shows about military teams exploring the galaxy via a network of alien transportation devices.  Played by Kavan Smith, Evan Lorne was first introduced as a recurring character in the seventh season of "Stargate SG-1", holding the military rank of Major in the United States Air Force.  He joins the Atlantis expedition after "The Siege" as one of the personnel on the "Daedalus" class battlecruiser.

George Hammond (Stargate): Lieutenant General George S. Hammond, USAF (Ret.)  is a fictional character in the "Stargate franchise".  Played by American actor Don S. Davis, General Hammond serves as the commander of Stargate Command (SGC) in the first seven seasons of the television series "Stargate SG-1".  He is relieved of command in the series' season 7 finale "Lost City", but becomes head of the new Homeworld Security department at the beginning of season 8.  Hammond's off-screen retirement is confirmed in "SG-1"' s season 10, and the character's death is mentioned in the series finale of "SG-1"' s spin-off series "Stargate Atlantis", "Enemy at the Gate".

Stargate: Continuum: Stargate: Continuum is a 2008 Canadian-American military science fiction direct-to-video film in the "Stargate" franchise.  It is the second sequel to television series "Stargate SG-1" following "".  It is directed by Martin Wood, director and producer of many episodes of "Stargate SG-1" and "Stargate Atlantis", written by "SG-1" and "Atlantis" creator Brad Wright, and produced by Wright and "Ark of Truth" director Robert C. Cooper.

Stargate SG-1: Stargate SG-1 (often abbreviated as SG-1) is an adventure and military science fiction television series and part of Metro-Goldwyn-Mayer's "Stargate" franchise.  The show, created by Brad Wright and Jonathan Glassner, is based on the 1994 science fiction film "Stargate" by Dean Devlin and Roland Emmerich.  The television series was filmed in and around the city of Vancouver, British Columbia, Canada.  The series premiered on Showtime on July 27, 1997 and moved to the Sci Fi Channel on June 7, 2002; the final episode first aired on Sky1 on March 13, 2007.  With 214 episodes over ten seasons, "Stargate SG-1" had surpassed "The X-Files" as the longest-running North American science fiction television series, until it was surpassed by the series "Smallville" in 2011.

Richard Dean Anderson: Richard Dean Anderson (born January 23, 1950) is an American actor and producer.  He began his television career in 1976, playing Dr. Jeff Webber in the American soap-opera series "General Hospital", then rose to prominence as the lead actor in the television series "MacGyver" (1985–1992).  He later appeared in films such as "Through the Eyes of a Killer" (1992), "Pandora's Clock" (1996), and "Firehouse" (1997).

Stargate SG-1 (season 1): The first season of the military science fiction television series "Stargate SG-1" commenced airing on the Showtime channel in the United States on July 27, 1997, concluded on the same channel on March 6, 1998, and contained 22 episodes.  The show itself is a spin off from the 1994 hit movie, "Stargate" written by Dean Devlin and Roland Emmerich.  Stargate SG-1 re-introduced supporting characters from the film universe, such as Jonathan "Jack" O'Neill and Daniel Jackson and included new characters such as Teal'c, George Hammond and Samantha "Sam" Carter.  The first season was about a military-science expedition team discovering how to use the ancient device, named the Stargate, to explore the galaxy.  However, they encountered a powerful enemy in the film named the Goa'uld, which is bent on destroying Earth and all that oppose them.

Stargate SG-1 (season 8): Season eight of "Stargate SG-1", an American-Canadian military science fiction television series, began airing on July 9, 2004 on the Sci Fi channel.  The eighth season concluded on February 22, 2005, after 20 episodes on British Sky One, which overtook the Sci Fi Channel in mid-season.  This was the first season of the show to have 20 episodes instead of 22, as well as the first to air concurrently with "Stargate SG-1" spinoff series "Stargate Atlantis" (the first season thereof).  The series was originally developed by Brad Wright and Jonathan Glassner, while Brad Wright and Robert C. Cooper served as executive producers.  Season eight regular cast members include Richard Dean Anderson, Amanda Tapping, Christopher Judge, and Michael Shanks.  The eighth season begins with the SG-1 team trying to revive Colonel Jack O'Neill (Richard Dean Anderson) after the events of the seventh season.  At the end of the two-episode season opener, Colonel O'Neill is promoted to General and assumes command of Stargate Command (SGC), while Major Samantha Carter (Amanda Tapping) is promoted to Lieutenant Colonel and assumes command of SG-1.  The season arc centers on the growing threat and seemingly final defeat of the Goa'uld and the Replicators, races who were introduced in the first and third season of the show, respectively.

Stargate SG-1 (season 4): Season four of "Stargate SG-1", an American-Canadian television series, began airing on June 30, 2000 on Showtime.  The fourth season concluded after 22 episodes on February 14, 2001 on British Sky One, which overtook Showtime in mid-season.  The series was developed by Brad Wright and Jonathan Glassner.  Season four regular cast members include Richard Dean Anderson, Michael Shanks, Amanda Tapping, Christopher Judge, and Don S. Davis.

Redemption (Stargate SG-1): The two-part episode "Redemption" is the Season 6 premiere of the science fiction television series "Stargate SG-1".  Airing on June 7 and June 14, 2002, it was the first all-new "SG-1" episode to be broadcast by SCI FI, the new home of "SG-1" after the series' move from Showtime.  The episode was written by producer Robert C. Cooper, and directed by Martin Wood.  "Redemption" is the first episode where actor Corin Nemec had main cast status, his character Jonas Quinn replacing Daniel Jackson (played by Michael Shanks) who died at the end of season 5.  The episode also marks the second appearance of David Hewlett's character Rodney McKay, who later became a main character on "Stargate Atlantis".  "Redemption Part 2" was nominated for a Gemini Award in the category "Best Visual Effects".

Stargate Atlantis (season 5): The fifth and final season of the military science fiction television series "Stargate Atlantis" commenced airing on the Sci Fi Channel in the United States on July 11, 2008, concluded on the same channel on January 9, 2009, and contained 20 episodes.  The show itself is a spin off of its sister show, "Stargate SG-1".  The season upgrades previous supporting characters cast members such as Richard Woolsey (from "Stargate SG-1") and Jennifer Keller.  Amanda Tapping's character Samantha Carter was downgraded to recurring character in this season.  The fifth and final season is about a military-science expedition team fighting against the Wraith from their base of operation, Atlantis.  The Wraith primary goal is to gather a fleet to invade Atlantis and find their new "feeding ground", Earth.

Supporting paragraphs: Stargate SG-1 (season 4) Richard Dean Anderson
Answer: January 23, 1950