Stewart served as multiple different kinds of associates for the Kansas City Royals. In 1985, Stewart served as a Director of Scouting. In 1986, he was both, Scouting Director and Player Development. From 1987 to 1997, he served as only a Scouting Director. The next two years, from 1998 to 1999, Stewart became the Senior Special Assistant to General Manager. From 2001 to 2005, Stewart become the Senior Advisor to the General Manager.
Stewart is the longest tenured Kansas City Royals associate and he was inducted into the Kansas City Royals Baseball Hall of Fame during 2008 season, on June 28. Stewart will represent the Kansas City Royals Hall of Fame class of 2008, becoming the 23rd member of the elite group. Stewart is the Kansas City Royals Senior Advisor to General Manager (GM) Dayton Moore. 70 players that Stewart drafted have played Major League Baseball. Some players that he drafted include Bo Jackson, Kevin Appier, Brian McRae, Mike Sweeney, Johnny Damon, Joe Randa and Carlos Beltran. Stewart has been an associate in baseball now for fifty-nine baseball seasons. Stewart is currently in his forty-third season with the Kansas City Royals.
- "Art Stewart Royals Hall of Fame induction ceremony set for June 28". MLB.com. Retrieved 2008-08-10.
- "Titles of Art Stewart". www.baseballamerica.com. Retrieved 2008-08-10.
- "Art Stewart selected to Royals Hall of Fame". MLB.com. Retrieved 2008-08-05.
- "Royals Hall of Fame Class of 2008: Art Stewart". royals.mlblogs.com. Retrieved 2008-08-06.