US pasta supplier New World Pasta Company has announced the appointment of Peter E. Cotter as interim president and chief operating officer and Horst O. Sieben as interim vice president and chief financial officer, following the resignation of John E Denton and Wayne E Robison. Cotter replaces Denton, the company's former chairman and chief executive officer, while Sieben replaces Robison, the company's former vice president and chief financial officer.