About The Authors Frank and Rudolf Mahnke are partners in the environmental design firm Mahnke & Mahnke, which is based in Geneva and San Diego. The authors, both internationally recognized color consultants, have devoted their careers to the study and application of color and light in the designed environment. They have traveled and lectured extensively to colleges, universities, and professional societies, and they have been widely interviewed on radio and television. Frank Mahnke was appointed President of the International Association of Color Consultants (I.A.C.C) in 1988. The I.A.C.C., which has branches in thirteen countries, has had an educational center in Salzburg, Austria, for over 34 years, that provides comprehensive interdisciplinary training in the field of color. This program was brought to the U.S.A. by Frank Mahnke in 1991, and is being conducted in cooperation with Mr. Mahnke's American information Center for Color and Environment.