Walter Zifkin has stepped down as a member of the Los Angeles Board of Airport Commissioners, airport officials said.

Zifkin will resign from the board that oversees the city-owned airports, including Los Angeles International Airport, effective Sept. 17, airport spokesman Marshall Lowe said.

The longest serving member of the Airport Commission, Zifkin was appointed to the board by former Mayor James Hahn in 2004. Zifkin, the CEO emeritus of the William Morris Agency, delivered his letter of resignation to Mayor Antonio Villaraigosa earlier this month, expressing gratitude to those he worked with, said Gina Marie Lindsey, executive director of Los Angeles World Airports.

In a memo to airport personnel, Lindsey noted that LAWA has experienced “remarkable change” since Zifkin joined the commission.

“At each milestone, at each point of decision, at each moment when wisdom and clarity were needed most, Walt delivered ideas and judgement grounded in very hard work and rare intellectual discipline,” Lindsey wrote.

In addition to the Airport Commission, Zikfin has served on the executive committee of the board of Cedars-Sinai Health System, the board of Vista Del Mar Child and Family Services and the board of the Los Angeles Police Foundation.