Liberty Co. Insurance Brokers in Woodland Hills has acquired a majority stake in Mitchell & Mitchell Insurance Agency, based in Novato. “We could not be more excited to welcome the impressive team from Mitchell & Mitchell and the wealth of experience they bring to Liberty for professional liability and program business,” Jerry Pickett, chief executive of Liberty Co., said in a statement. The acquisition gives Liberty Co. access to Mitchell & Mitchell’s client base of lawyers, dentists and certified professional accountants. Mitchell & Mitchell is the exclusive agent for CNA Financial Corp.’s professional liability program for attorneys in California, Liberty said. The insurance brokerage said Monday that the deal officially closed Aug. 10. Financial terms were not disclosed. Novato is in Marin County north of San Francisco.