After five years, Peter Lynn is leaving as executive director of the sprawling Los Angeles Homeless Services Authority, or LAHSA. That means the duel city-county agency needs to find a new chief. The commission that oversees LAHSA is starting a national search to find a new director. For now, the agency will be run by Heidi Marston who currently works as the LASHA Chief Program Officer. She’ll oversee an organization that has grown substantially over the past 5 years.