Donald Rumsfeld served as CEO, and then as President, of Searle between 1977 and 1985. During his tenure at Searle, Rumsfeld reduced the number of employees in the company by 60%. In 1985, he engineered the acquisition of Searle by Monsanto Corporation. In April 2000, Pharmacia Corporation was created by merging Pharmacia & Upjohn (which had come about as the result of an earlier merger of the companies Pharmacia and Upjohn ) with Monsanto and its Searle unit.  The merged company was based in Peapack, New Jersey . Pfizer acquired Pharmacia in 2003 and retired the Searle name.