WHISTLE BLOWER EXITS WITH FAMILIAR TUNE

Geoffrey (Joff) Mattson, the agent trainee at ICM who, sources said, blew the whistle on the four ICM agents that left in the middle of the night to start their own agency, is leaving ICM. His plans are not known.

When asked in March about the latenight March 29 defection, Mattson, former assistant to TV agent Alan Berger, said: “I have absolutely no idea what you’re talking about.”

Insiders at ICM confirmed his departure Aug. 31. When reached at his office, Mattson said: “I don’t know what you’re talking about.” ICM had no comment.

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