MENLO PARK, Calif.--(BUSINESS WIRE)--Sept. 14, 2006--Venrock Associates, one of the country's leading venture capital firms focusing on early stage investing, today announced the addition of two new venture partners, Bill Rastetter to the Menlo Park, Calif. office, and David Molowa to the New York office. The firm also announced the promotion of Bryan Roberts and Brian Ascher both based in the Menlo Park office.