Kirk Souder, a co-founder of L.A. agency Ground Zero who has been away from the business since 2001, has been named president and executive creative director at Publicis & Hal Riney in San Francisco. ... David Lewis Kennedy, fomerly of DDB/Chicago, has joined Boston boutique Modernista! as a copywriter. ... Mike Pilato, formerly of Hill, Holliday, has joined Boston agency ISM as a senior art director. ... Editor Ellen Crocker, formerly of Cosmo Street, has joined Crew Cuts/West.