Question: What two topics has the writer of songs for an NBC television series lectured on?
Context: Kevin Glen Weisman is an American film, television and stage actor.  He has played Marshall Flinkman on the ABC television series "Alias" (2001–2006), Kives on the HBO television series and movie "Hello Ladies" (2013–14), Ray on the CBS television series "Scorpion", and Dr. Maynard on the NBC television series "The Blacklist".  Weisman plays Ned Berring in season one of the David E. Kelley series, "Goliath", streaming on Amazon Video. Vikram "Vik" Sahay is a Canadian actor of Indian descent best known for playing Kevin Calvin on Radio Active and Lester Patel, a member of the Nerd Herd in the NBC television series "Chuck" on which he became a series regular from the second season, and Rama in the "Roxy Hunter" saga.  Sahay's latest role is "Howard" on the NBC television sitcom Sean Saves the World premiering October 3, 2013. Jason Morgan Ritter (born February 17, 1980) is an American actor, and the son of actress Nancy Morgan and actor John Ritter, known for his roles as Kevin Girardi in the television series "Joan of Arcadia", Ethan Haas in "The Class", as Sean Walker in the NBC series "The Event", and as the voice of Dipper Pines in "Gravity Falls".  He also played the recurring role of Mark Cyr in the NBC television series "Parenthood", for which he received an Emmy Award nomination. Instant Replay is the seventh studio album by The Monkees.  Issued six months after the cancellation of the group's NBC television series, it is also the first album released after Peter Tork left the group and the only album of the original nine studio albums that does not include any songs featured in the TV show from the original NBC run nor the CBS/ABC reruns. Thomas Andrew "Tom" Lehrer ( ; born April 9, 1928) is a retired American musician, singer-songwriter, satirist, and mathematician.  He has lectured on mathematics and musical theater.  He is best known for the pithy, humorous songs he recorded in the 1950s and 1960s. 30 Rock Original Television Soundtrack is the soundtrack for the award-winning NBC television program "30 Rock".  The two-disc album consists largely of songs composed by Jeff Richmond, the co-producer and musical director of the show and the husband of the creator, writer, producer, and star, Tina Fey.  It includes the score of the series as well as some songs that have been featured in the show's first four seasons.  It was released on November 16, 2010 by Relativity Music Group.  On November 20, 2010, the cast of "30 Rock" did their first ever signing for the soundtrack at the NBC Experience Store at Rockefeller Center.  Appearances were made by Tina Fey, Jeff Richmond, Jane Krakowski, Jack McBrayer, John Lutz, Kevin Brown, and Grizz Chapman. Blake Masters is an American writer, director, and producer of films and television series.  He is the creator of the Showtime television series "Brotherhood", developer of the NBC television series "", and co-executive producer and writer of the NBC television series "Crossbones". Ben Queen is an American writer and producer.  He was the creator/showrunner for the NBC television show "A to Z".  He wrote the screenplays for the Pixar animated movies "Cars 2" and "Cars 3".  He was also the creator of the NBC television series, "Powerless" and the co-creator and executive producer of the Fox television series, "Drive". Randy Wayne White (born 1950) is an American writer of crime fiction and non-fiction adventure tales.  He has written New York Times best-selling novels and has received awards for his fiction and a television documentary.  He is best known for his series of crime novels featuring the retired NSA agent Doc Ford, a marine biologist living on the Gulf Coast of southern Florida.  White has contributed material on a variety of topics to numerous magazines and has lectured across the United States.  A resident of Southwest Florida since 1972, he currently lives on Pine Island, where he is active in South Florida civic affairs and with the restaurant Doc Ford's Sanibel Rum Bar & Grill on nearby Sanibel Island. That Was the Year That Was (1965) is a live album recorded at the hungry i in San Francisco, containing performances by Tom Lehrer of satiric topical songs he originally wrote for the NBC television series "That Was The Week That Was", known informally as "TW3" (1964–65).  All of the songs related to items then in the news.
Answer: mathematics and musical theater