Scott Marshall, 50, has headed the shop
In June 2002, the agency's founder, Hal Riney, relinquished his remaining duties and became chairman emeritus, and has subsequently virtually cut his ties to the shop.
Mr. Marshall plans to go into a "hands on" business for a while and may not necessarily return to the agency business, a person familiar with the situation said.
Publicis & Hal Riney has seen its billings shrink in recent years, especially following the loss of its marquee account, Saturn Motor Corp.'s $300 million account.
Current agency clients include Sprint PCS and Hewlett-Packard, which it shares with Omnicom Group's Goodby, Silverstein & Partners, the agency that eventually picked up the Saturn account.