Question: What year was the current athletic director of a school located in Norman born?

Context paragraphs:
Mike Thomas (athletic director): Michael J. Thomas is an American university administrator, and the current athletic director at Cleveland State University.  Thomas was previously athletic director at the University of Illinois from 2011-2015, University of Cincinnati from 2005-2011, and the University of Akron from 2000-2005.  Previously, he served as an associate athletic director at the University of Virginia and the University of Denver, and spent a year at the University of Iowa as an administrative intern.

Gary Barta: Gary Barta (born September 4, 1963) is the current athletic director at the University of Iowa.  He succeeded Bob Bowlsby on August 1, 2006, when Bowlsby stepped down after 15 years as Iowa's athletic director to take the same position at Stanford University.  Before coming to Iowa, Barta was the athletic director at the University of Wyoming from 2003 to 2006.  In early 2005, Barta was a finalist for the Athletic Director position at Arizona State University.  Prior to serving as the athletic director at Wyoming, Barta served as an administrator in the athletic departments at the University of Washington, and Northern Iowa University.

Sandy Barbour: Anne Saunders "Sandy" Barbour (born December 2, 1959) is the current athletic director at the Pennsylvania State University.  Prior to her current position at Penn State, she was the Athletic Director of the University of California, Berkeley from 2004 to 2014.  She was also named one of the top 100 influential women in business in San Francisco.

Ryan Bamford: Ryan Bamford is the current athletic director of the University of Massachusetts Amherst.  He was previously hired on March 23, 2011 as an associate athletic director at Georgia Institute of Technology by then athletic director Dan Radakovich and promoted to senior associate in June 2013 by incoming athletic director Mike Bobinski.

Oklahoma Sooners: The Oklahoma Sooners are the athletic teams that represent the University of Oklahoma, located in Norman.  The 19 men's and women's varsity teams are called the "Sooners", a reference to a nickname given to the early participants in the Land Rush of 1889, which initially opened the Unassigned Lands in the future state of Oklahoma to non-native settlement.  The university's athletic teams compete in the National Collegiate Athletic Association (NCAA)'s Division I in the Big 12 Conference.  The university's current athletic director is Joe Castiglione.

George Nessman: George Raymond Nessman II (born March 22, 1959) is an American athletic administrator and former college basketball coach who is the current athletic director at Justin-Siena High School.  Nessman coached at the high school and community college levels before becoming an assistant basketball coach at California in 2004.  From 2005 to 2013, Nessman was the men's basketball head coach at San Jose State.  He was also athletic director at Porterville College from 1995 to 2001 while also serving as men's basketball head coach.

Peter Roby: Peter P. Roby (born August 27, 1957) is the current athletic director of Northeastern University.  Roby was introduced as the ninth athletic director of the university in June 2007.  In 2007 Roby was named as one of the 100 Most Influential Sports Educators.

Greg Christopher: Greg Christopher is the current athletic director for Xavier University.  He was previously the athletic director at Bowling Green State University from 2006 to 2013.  Christopher was an associate athletic director at Purdue University, joining the department in 1997.

Mack Rhoades: Mack Bernard Rhoades IV is the current athletic director at Baylor University, announced on July 13, 2016.  He formerly held the same position at the University of Missouri.  On March 8, 2015, it was announced he would be leaving the University of Houston to take over the Athletic Director position at the University of Missouri.  Rhoades had been hired at Akron in December 2005 after former Zips athletic director Mike Thomas took the same position at the University of Cincinnati.

Joe Castiglione (athletic director): Joseph Robert Castiglione (born October 8, 1957) is Vice President for Intercollegiate Athletics Programs and Director of Athletics at the University of Oklahoma.

Supporting paragraphs: Oklahoma Sooners Joe Castiglione (athletic director)
Answer: 1957