Definition: In this task, you will be presented with a text and a pronoun. You should write the name that the pronoun refers to. Position of the pronoun in the text is showed within two "_"s.

Positive Example 1 -
Input: He grew up in Evanston, Illinois the second oldest of five children including his brothers, Fred and Gordon and sisters, Marge (Peppy) and Marilyn. His high school days were spent at New Trier High School in Winnetka, Illinois. MacKenzie studied with Bernard Leach from 1949 to 1952. _His_ simple, wheel-thrown functional pottery is heavily influenced by the oriental aesthetic of Shoji Hamada and Kanjiro Kawai. <sep>, Pronoun: His
Output: MacKenzie

Positive Example 2 -
Input: The current members of Crime have also performed in San Francisco under the band name ''Remote Viewers``. Strike has published two works of fiction in recent years: Ports of Hell, which is listed in the Rock and Roll Hall of Fame Library, and A Loud Humming Sound Came from Above. Rank has produced numerous films (under _his_ real name, Henry Rosenthal) including the hit The Devil and Daniel Johnston. <sep>, Pronoun: his
Output: Henry Rosenthal

Negative Example 1 -
Input: He had been reelected to Congress, but resigned in 1990 to accept a post as Ambassador to Brazil. De la Sota again ran for governor of C*rdoba in 1991. Defeated by Governor Angeloz by over 15%, this latter setback was significant because it cost De la Sota much of _his_ support within the Justicialist Party (which was flush with victory in the 1991 mid-terms), leading to President Carlos Menem 's endorsement of a separate party list in C*rdoba for the 1993 mid-term elections, and to De la Sota's failure to regain a seat in Congress. <sep>, Pronoun: his
Output: Angeloz

Negative Example 2 -
Input: When she returns to her hotel room, a Liberian man (Tony Todd) forces her to smuggle $20 million worth of conflict diamonds to New York, or else fellow fight attendant and friend Angela will die. She is caught before she can board the flight, and the team now have nine hours until the plane lands, and save Angela. After the confiscated diamonds are stolen by the brother of Kaleo (Jason Scott Lee), whom Danny put away for murdering _his_ partner last year, Five-0 and Chief Fryer team up and enlist the help of August March (Ed Asner), who served a 30-year sentence for smuggling diamonds. <sep>, Pronoun: his
Output: Tony

Now complete the following example -
Input: Bernard Osgood Koopman (1900 -- August 18, 1981) was a French-born American mathematician, known for his work in ergodic theory, the foundations of probability, statistical theory and operations research. After living in France and Italy, the Koopmans immigrated to the United States in 1915. Koopman was a student of George David Birkhoff and _his_ initial work concentrated on dynamical system s and mathematical physics. <sep>, Pronoun: his
Output: 


Answer: Koopman