Rostam Mirkarimi (born August 4, 1961) is an American politician and the former sheriff of San Francisco. Prior to being sheriff, he served on the San Francisco Board of Supervisors, where he represented District 5. Mirkarimi is a co-founder of the Green Party of California. Elected as a supervisor, Mirkarimi received national attention in 2007 when he introduced the first legislation prohibiting the use of non-biodegradable plastic bags by large supermarkets and drugstores, making San Francisco the first city to do so.