Director Kevin Sarnoff has signed with Stone Core Films, Dallas, for representation in the Southwest. Sarnoff's "Boxer" spot for Tabasco, shot via Gang Films, Paris, was shortlisted at this year's Cannes festival. ... Composer Dan Zank, who has recently scored spots for Snickers and Jeep, has signed with Yessian Music/New York. ... Argentine director Martin Lobo has signed with Cibolo Films, San Antonio, for representation in the U.S. Hispanic market.