Gearon Hoffman has added Jessica Liu as an account coordinator. She will work on the Papa Gino's business and others at the Boston agency. Prior to joining Gearon, Liu held a similar position at the Council on International Exchange. Gearon claims more than $70 million in billings, making it one of the New England region's largest independently owned shops. Other key clients include CGM Mutual Funds, Expert Satellite, Scottrade and Tufts Health Plan.