Wyeth ( WYE) on Friday said Bernard Poussot, president and vice chairman, would add the title of chief operating officer and also become a director. Poussot, 55, remains in charge of Wyeth's prescription drug, consumer products, animal health and R&D units. He is the 13th member of Wyeth's board. He joined Wyeth in 1986, and he was named president and vice chairman in April, assuming the president's title from Robert Essner, who is chairman and CEO. The other vice chairman is Kenneth Martin, who also received the title in April. Martin, a Wyeth employee since 1984, is chief financial officer and is in charge of information services and global business operations.