Prolingua is a very focused and committed group of training professionals whose objective is to provide a service that exceeds our client’s expectations on all dimensions. Since 1994, Prolingua has grown steadily and now has more than 100 corporate clients.

We invite you to explore our web site and feel free to contact us at

Bio for Mark Lewis

mark lewisMark Lewis designs and writes all of Prolingua’s curriculum, based on his 15 plus years of training Japanese business people. He is also responsible for hiring and training Prolingua instructors. Mr. Lewis earned a bachelors degree in business administration from the University of Southern California, and an MBA from California State University at Long Beach. His work experience includes employment as an inspector with the U.S. Customs service, as a manager with a major U.S. Freight company and as an instructor with several Tokyo based training companies.

Bio for Masao Maeda

Masao MaedaMasao Maeda handles Prolingua’s finances and general administration, in addition to client support. His previous work experience includes managing retail outlets for Yamaha Inc., and as a curriculum director for another large language training company.

Bio for Mitsuru Sakai

Mitsuru SakaiMitsuru Sakai has accumulated more than 45 years of experience providing foreign language training and has worked with many of the top international companies in Tokyo, Osaka, Nagoya and Fukuoka. He also has experience as a textile importer for a Japanese trading company and is an avid golfer.