Problem: Background: Clint Patrick Black was born in Long Branch, New Jersey, the youngest of four children born to G.A. and Ann Black, and lived in nearby Red Bank. The family moved back to Texas, where G.A. Black had been raised, before Clint was one year old. He was raised in Katy, Texas. Music was always present in the house.
Context: Shortly after his music career took off, began receiving offers for acting roles. He turned down every request until 1994, when he was offered a bit part in the star-studded comedy film Maverick. Although the part required very little actual acting, after the movie's release Black received an increasing number of calls from directors who thought he would be perfect for a particular role. Black has appeared in several television shows, including Wings and The Larry Sanders Show. He has since starred in the 1998 television film, Still Holding On: The Legend of Cadillac Jack, based on the rodeo star Jack Favor, who was falsely accused of double murders in Haughton, Louisiana in 1967. Lisa Hartman Black portrayed Ponder I. Favor, Jack's wife. Black had a major role in another television movie Going Home, and appeared briefly in the 2003 film Anger Management.  He has also had a presence on various reality television shows. In 2003, Black appeared on Nashville Star, where he acted as a mentor to the contestants. He later produced the debut album of series winner Buddy Jewell. In 2004, Clint appeared as himself in the TV show Las Vegas. In 2008, Black was a contestant on a short-lived CBS reality show, Secret Talents of the Stars, in which he practiced stand-up comedy. The following year, he competed on the second season of Celebrity Apprentice. He was fired after the eleventh task, placing himself in fifth place, although he returned as a member of Joan Rivers' victorious team in the season finale. In 2009, Black appeared on ABC's Extreme Makeover: Home Edition.  Black has enjoyed his television experiences, describing acting as "another way for me to expand my creative canvas. ... I love to challenge myself." He believes that most of his fans "just see me as a musician who is stepping into [television and film] temporarily and either doing it alright or not". More recently, he appeared in the movies Flicka 2 in 2010 and Flicka 3 in 2011.  On July 4, 2012, Black appeared on an episode of Lifetime's reality series, Coming Home, which documents servicemen and women returning to their loved ones in surprise reunions. In the episode, he is featured helping two children write a song about their Army captain father, who is returning from Afghanistan to surprise his family.  On July 24, 2012 Black is surprised by History Detectives on PBS. In the episode, the show pays a visit to his Nashville residence, to uncover the story behind an artifact given to him by his wife decades ago.
Question: Who has been some of his co-stars?
Answer: Joan Rivers

Background: Herbert Alexander Simon (June 15, 1916 - February 9, 2001) was an American economist and political scientist whose primary interest was decision-making within organizations and is best known for the theories of "bounded rationality" and "satisficing". He received the Nobel Prize in Economics in 1978 and the Turing Award in 1975. His research was noted for its interdisciplinary nature and spanned across the fields of cognitive science, computer science, public administration, management, and political science. He was at Carnegie Mellon University for most of his career, from 1949 to 2001.
Context: Herbert Alexander Simon was born in Milwaukee, Wisconsin, on June 15, 1916. His father, Arthur Simon (1881-1948), was an electrical engineer who had come to the United States from Germany in 1903 after earning his engineering degree from the Technische Hochschule of Darmstadt. An inventor who was granted "several dozen patents", his father also was an independent patent attorney. His mother, Edna Marguerite Merkel, was an accomplished pianist whose ancestors had come from Prague and Cologne. His European ancestors had been piano makers, goldsmiths, and vintners. Simon's father was Jewish and his mother came from a family with Jewish, Lutheran, and Catholic backgrounds. Simon called himself an atheist.  Simon was educated in the Milwaukee public school system, where he developed an interest in science. He found schoolwork to be interesting and easy. Unlike many children, Simon was exposed to the idea that human behavior could be studied scientifically at a relatively young age due to the influence of his mother's younger brother, Harold Merkel, who had studied economics at the University of Wisconsin-Madison under John R. Commons. Through his uncle's books on economics and psychology, Simon discovered the social sciences. Among his earliest influences, Simon has cited Richard Ely's economics textbook, Norman Angell's The Great Illusion, and Henry George's Progress and Poverty. At that time, Simon argued "from conviction, rather than cussedness" in favor of George's controversial "single tax" on land rents.  In 1933, Simon entered the University of Chicago, and following those early influences, he studied the social sciences and mathematics. He was interested in biology, but chose not to study it because of his "color-blindness and awkwardness in the laboratory". He chose instead to focus on political science and economics. His most important mentor was Henry Schultz, an econometrician and mathematical economist. Simon received both his B.A. (1936) and his Ph.D. (1943) in political science, from the University of Chicago, where he studied under Harold Lasswell, Nicholas Rashevsky, Rudolf Carnap, Henry Schultz, and Charles Edward Merriam.  After enrolling in a course on "Measuring Municipal Governments", Simon was invited to be a research assistant for Clarence Ridley, with whom he coauthored Measuring Municipal Activities in 1938. Eventually his studies led him to the field of organizational decision-making, which would become the subject of his doctoral dissertation.
Question: who was his mother?
Answer:
His mother, Edna Marguerite Merkel, was an accomplished pianist whose ancestors had come from Prague and Cologne.