Rivet St. Louis has added Noah Rosenberg as interactive creative director from Ogilvy, Durham, North Carolina. ...Los Angeles-based creative studio Duck has signed director and animator Mato Atom. ...Production company Nexus has signed the Brazilian director CISMA, also known as Denis Kamioka. CISMA is Portuguese for a strong and irrational conviction. ... Stephanie Naman has joined Birmingham, Alabama-based Luckie & Co. as associate creative director and copywriter. ...Starmark International has appointed Alan Whitley, formerly of JWT, Atlanta, as executive creative director.