Question: William Russell Geist, is an American television personality, journalist and humorist, and also frequently serves as fill-in anchor on "Today" for Matt Lauer, an American television journalist and host, and also a contributor for which program?
Context: Pablo S. Torre (born September 27, 1985) is an American sportswriter and columnist for ESPN.com and ESPN The Magazine.  Torre is a regular guest on various ESPN shows such as Around the Horn and The Sports Reporters.  He also frequently serves as an alternate host for Around the Horn, Highly Questionable, and Pardon the Interruption.  He has also appeared on Outside the Lines, The Dan Le Batard Show with Stugotz, and TrueHoop.  Aside from ESPN-related productions, Torre is also a contributor to National Public Radio. Hyunju "Juju" Chang (born September 17, 1965) is an American television journalist for ABC News, and currently serves as an anchor of "Nightline".  She previously served as a special correspondent and fill-in anchor for "Nightline".  Previously she was the news anchor for ABC News’ morning news program "Good Morning America" from 2009–2011. Alison Harmelin is an American television journalist for CBS News based in the network's headquarters in New York City.  Harmelin recently served as a fill-in anchor for CBS News Up-to-the-minute, the network's overnight magazine-style broadcast.  She has also served as a fill-in anchor for the CBS Morning News and CBSN, the network's newly launched streaming channel.  Harmelin is a correspondent for CBS Newspath the network's 24-hour daily news service.  Harmelin also anchors and reports for CBS MoneyWatch and is a frequent contributor to CBS Radio News and CBSNews.com. Garvin Thomas Snell, known professionally by his screen name Garvin Thomas is a television journalist currently with NBC Bay Area, KNTV, in the San Francisco Bay Area.  He is a reporter, photographer, editor, and sometimes fill-in anchor.  He is in charge of the Bay Area Proud franchise, which "profiles the people, the groups, and the companies making the Bay Area, and the world, a better place to live."  Prior to joining NBC Bay Area, Thomas had worked in Boston, Minneapolis, Los Angeles and overseas in Berlin, Germany. Thomas Albert Roberts (born October 5, 1972) is an American television journalist who, since April 2010, has served as a news anchor for MSNBC, a cable-news channel.  He currently anchors "MSNBC Live", the daytime news platform of NBC News, on weekends from 5-7pm ET.  Before that he was anchor of "Way Too Early" and a contributor to "Morning Joe".  He is also an NBC News correspondent and is a fill-in anchor on "Today" and "NBC Nightly News with Lester Holt". Piya Chattopadhyay is an award-winning Canadian journalist known for her work on CBC Radio, as well as on Fox News Radio, and TVOntario.  She is known primarily as a fill-in anchor and host on TVOntario and the CBC's radio and television networks, including on "The Agenda", "The Current", "Q", "The World at Six" and "Cross-Country Checkup". Robin Carolle Brantley (born August 4, 1957), known professionally as Robin Robinson, is a longtime Chicago television news anchor best known for her 27 years as main news anchor at Fox-owned WFLD-TV in Chicago.  She can now be heard on the radio at WBBM (AM) as a fill-in anchor/reporter and WVON as host of her own show, 'Robin's Nest.' Matthew Todd Lauer (born December 30, 1957) is an American television journalist and host of "The Today Show".  He is also a contributor for "Dateline NBC".  He was previously a news anchor for "The Today Show" in 1994 and anchor for WNBC in New York City and a local talk-show host in Boston, Philadelphia, Providence, and Richmond.  He was also host of "PM Magazine" (or "Evening Magazine" 1980–86).  In the early 1990s, Lauer hosted segments of HBO Entertainment News. Ashlan McKain Gorse (born December 14, 1980) is an American entertainment journalist who worked as a correspondent and fill-in anchor for E!: Entertainment Television.  She joined the network in May 2008.  Before joining E! News, Gorse was the host of E! News Now.  Gorse left E! in June 2013. William Russell Geist (born May 3, 1975) is an American television personality, journalist and humorist.  He is co-anchor of MSNBC’s "Morning Joe" and anchor of "Sunday Today with Willie Geist".  Geist also frequently serves as fill-in anchor on "Today" for Matt Lauer.  Geist is a Correspondent for NBC News and NBC Sports, hosting and contributing to NBC's Olympic coverage.
Answer: Dateline NBC