Rolf C. Hagen Inc. has announced the appointment of Dieter Hagen as vice chairman and executive vice president of sales. Dieter Hagen joined the company in 1959 after it was founded by his brother Rolf C. Hagen in 1955. He has had a direct and significant impact on the growth and success of Rolf C. Hagen Inc. for 53 years, the company said.