Question: Boyd Matson is the former anchor of "National Geographic Explorer", an American documentary television series that originally premiered on what network on April 7, 1985?

full_context: Document 1: National Geographic Explorer: National Geographic Explorer (or simply Explorer) is an American documentary television series that originally premiered on Nickelodeon on April 7, 1985, after having been produced as a less costly and intensive alternative to PBS's "National Geographic Specials" by Pittsburgh station WQED. The first episode ("Herculaneum: Voices from the Past") was produced by WQED and featured long-time "Explorer" camerman Mark Knobil, who is the few staff members with the franchise during all 24 seasons. The program is the longest-running documentary television series on cable television. Presented every Sunday from 5:00 pm to 8:00 pm, the original series was three hours in length, containing five to ten short films. Although the National Geographic Society had been producing specials for television for 20 years prior to "Explorer", the premiere of the series required an increase in production from 4 hours of programming a year to 156 hours. Tim Cowling and Tim Kelly were the executive producers for the series during this transition.
Document 2: Expedition Unknown: Expedition Unknown is an American reality television series that premiered on January 8, 2015, on the Travel Channel. Produced by Ping Pong Productions, the program follows archaeologist, explorer, and television presenter Josh Gates on adventures to investigate the world's most enduring legends and mysteries. The series currently airs Wednesdays at 9:00 p.m. ET/PT. The second season of Expedition Unknown premiered October 7, 2015and on March 24, 2016, the Travel Channel renewed the series for a third season, which premiered on November 2, 2016. On March 14, 2017, the Travel Channel renewed the series for a fourth season.
Document 3: Bryant Gumbel: Bryant Charles Gumbel (born September 29, 1948) is an American television journalist and sportscaster, best known for his 15 years as co-host of NBC's "Today". He is the younger brother of sportscaster Greg Gumbel. Since 1995, he has hosted HBO's acclaimed investigative series "Real Sports with Bryant Gumbel", which has been rated as "flat out TV's best sports program" by the "Los Angeles Times". It won a Peabody Award in 2012.
Document 4: Michael Bryson: Michael G. Bryson (August 22, 1942 – May 22, 2012) was a news and sports reporter and editor from Des Moines, Iowa and the elder brother of travel writer Bill Bryson. He co-authored a book "The Babe Didn't Point: And Other Stories About Iowans and Sports" with his son Michael G. Bryson Jr in 1989. He also wrote a book called "The Twenty-Four-Inch Home Run" in 1990. Bryson was an editor and associate publisher of the Sun Press Newspapers in Hawaii from 1979 to 1986. He covered the New York Mets in 1969 while a sports reporter for the Associated Press. He was a news reporter for the "Des Moines Register and Tribune" from 1970 to 1979. He attended Drake University.
Document 5: Real Life with Jane Pauley: Real Life with Jane Pauley was a newsmagazine television program aired in the United States by NBC from 1990 to 1991. "Real Life with Jane Pauley" seemed to be presented as an answer to both critics and members of the general public to the frequently-repeated viewpoint that "television news never seems to show anything positive". "Real Life" focused on positive, human interest-type stories and occasional celebrity profiles. Jane Pauley also presented less uplifting but still-lightweight features as well, such as a feature focusing on how less than 20% of the people who owned VCRs at the time actually knew how to program them. Boyd Matson was also featured as a correspondent; his reports featured stories on out of the way places.
Document 6: Louisa Hodge: Louisa Hodge is an award-winning Emmy winner and two-time Emmy nominee meteorologist/weather anchor/general assignment reporter for KCBS-2/KCAL-9 at CBS Studio Center in Studio City, Los Angeles, California. Previously she spent 2 years worked as a meteorologist/anchor/reporter for Independent TV KRON4 in San Francisco and prior to KRON4 she was a TV anchor and reporter for Tribune Fox affiliate KTXL in Sacramento, CA. She was a weeknight reporter and weekend weather anchor for Fox 40 News at 10 with Teri Cox and Joe Orlando. Prior to her arrival at KTXL in November 2005, she was a co-host for "Wake Up!" on KNVN and KHSL-TV in Redding as well as a Field reporter and weather reporter for NCN for a period of time since former anchor Maureen Naylor left NCN for ABC O&O KFSN in Fresno, CA. Prior to KNVN/KHSL, Louisa worked at WPTV in West Palm Beach, FL as a photographer and worked as an intern at "Good Morning America". Louisa is a Communications graduate from University of Vermont. Louisa currently resides in Santa Monica, Los Angeles area, California and enjoys traveling, snowboarding and exploring many outdooristic adventurisms.
Document 7: Gregg Murphy: Gregg Murphy is a sports journalist and was part of CN8's sports coverage. He hosted "Out of Bounds," an hour-long sports program, airing at 7 p.m. weeknights, that examines the nation's biggest sports stories.
Document 8: Tim T. Kelly: Timothy “Tim” T. Kelly is an American media executive, film producer, and conservationist. He is recognized for his role in moving the National Geographic Society from a primarily print-based organization to a multimedia global force in television and digital media. Kelly engineered the launch of the National Geographic Channel in 1997, and was named President of National Geographic in 2011. He also served as President and CEO of the National Geographic Global Media group and President and CEO of National Geographic Ventures. Kelly announced he would be leaving National Geographic in September 2012.
Document 9: Explore (TV series): Explore was a 1980s PBS TV show based upon the film footage filmed by explorer Douchan Gersi over the previous 20 years. The show was hosted by popular actor James Coburn.
Document 10: Brent Musburger: Brent Woody Musburger ( ; born May 26, 1939) is an American sportscaster, lead broadcaster and managing editor at Vegas Stats and Information Network (VSiN). He retired in January 2017 from the ESPN and ABC television networks. Formerly with CBS Sports and one of the original members of their program "The NFL Today", Musburger has also covered the NBA, MLB, NCAA football and basketball, and NASCAR and served as a studio host for games, a play-by-play man, and halftime host. He has also performed postgame wrap-up segments and covered championship trophy presentations. He is a member of the Montana Broadcaster's Association Hall of Fame.
Document 11: Secrets of the Dead: Secrets of the Dead is an ongoing PBS television series produced by Thirteen/WNET New York, which began in 2000. The show generally follows an investigator or team of investigators exploring what modern science can tell us about some of the great mysteries of history. Most programs incorporate primary source material, first hand accounts, dramatic reenactments, and computer-generated imagery (CGI) to tell the story. The series originated in a series of the same name in the United Kingdom first shown by Channel 4 in 1999. The first two seasons for each country were broadly similar, but thereafter diverged. The US series includes some programs shown in other Channel 4 series (e.g. "Secret History"). In the case of original British episodes, PBS re-edited, re-branded and finally re-narrated them with various American voice artists. PBS description: "Scientists seek to uncover celebrated mysteries of the past in this occasional British series."
Document 12: Boyd Matson: Boyd Matson (b. April 26, 1947) is the former anchor of "National Geographic Explorer" and a former co-anchor of NBC's "Sunday Today" program. He was also an NBC News correspondent in the 1980s, working mostly on news features and earlier as a sports reporter on KNBC in Los Angeles. He now hosts the show "Wild Chronicles" on PBS and the nationwide radio program NG Weekend. Matson also writes a monthly column for NG Traveler magazine. He lives in Virginia with his wife Betty Hudson and his two children.
Document 13: Dora the Explorer: Dora the Explorer is an American educational animated TV series created by Chris Gifford, Valerie Walsh, and Eric Weiner. "Dora the Explorer" became a regular series in 2000. The show is carried on the Nickelodeon cable television network, including the associated Nick Jr. channel. It aired on CBS until September 2006. A Spanish-dubbed version first aired as part of a "Nick en español" block on NBC Universal-owned Telemundo through September 2006; since April 2008, this version of the program has been carried on Univision as part of the "Planeta U" block. The series is co-produced by Nickelodeon Productions and Nickelodeon Animation Studio. "Dora the Explorer" is one of the longest-running shows of Nick Jr. During the sixth season, the show became the Nick Jr. series with the most episodes, surpassing "Blue's Clues" with 143 episodes, having 144 after it had completed broadcasting on television. It won a Peabody Award in 2003 "for outstanding efforts in making learning a pleasurable experience for pre-schoolers." It ended on June 5, 2014 after 8 seasons and 172 episodes.
Document 14: Great Migrations: Great Migrations is a seven-episode nature documentary television miniseries that airs on the National Geographic Channel, featuring the great migrations of animals around the globe. The seven-part show is the largest programming event in the ten-year history of the channel and is part of the largest cross-platform initiative since the founding of the National Geographic Society. It was filmed in HD, and premiered on November 7, 2010 with accompanying coverage in the "National Geographic" magazine and an official companion book.
Document 15: Documentary channel: A documentary channel is a specialty channel which focuses on broadcasting documentaries. Some documentary channels further specialize by dedicating their television programming to specific types of documentaries or documentaries in a specific area of knowledge. Documentary and The History Channel are examples of this. There is some overlap between news channels and documentary channels, but while a documentary channel may also broadcast programs about current affairs, it will, as a rule, air longer, more in-depth segments and not present up-to-the-minute news coverage. Also, many other TV channels regularly air documentaries, but unless a channel is significantly dedicated to documentary-type programming, it probably will not be considered a documentary channel. As of 2006, some of the most famous documentary channels are the Discovery Channel and the National Geographic Channel.
ground_truth: Nickelodeon