Steve Diamond, formerly an EVP-creative director at Hill, Holliday, has joined New York agency The Sloan Group as executive creative director. Diamond takes the creative reins from departing agency chief Cliff Sloan, who founded the agency in 1993. ... Former BBDO/N.Y. executive producer Adam Isidore has joined New York's Charlex as VP-executive producer. ... Animation director Paul Griffin, formerly of ILM and Weta Digital, has joined CaféFX in Santa Maria, Calif.