In 1902, he went to Belgium and started teaching English at Berlitz school.
In addition he has contributed definitions and other material to dictionaries and other language reference works issued by Oxford University Press, Cambridge University Press, Longman, Macmillan, HarperCollins, Chambers Harrap, Langenscheidt, Berlitz, Scholastic Corporation, and Merriam-Webster, among others.
He has worked as a steel mill laborer, a director of a Berlitz School of Languages, an art dealer, and a limousine driver as well as teacher, writer, and editor.
On December 13, 2007, Berlitz management held a party at the Roppongi Hills Grand Hyatt to celebrate good financial results.
Berlitz Corporation is a member of the Benesse Group, with more than 550 company-owned and franchised locations in more than 70 countries.
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Berlitz Corporation is a global leadership training and language education company with headquarters in Princeton, New Jersey.
The book is similar to the work of Charles Berlitz but Hassler never received mainstream recognition for his book like Berlitz did.
Publication of books such as The Roswell Incident by Berlitz and Moore in 1980, television shows and other media coverage perpetuated the UFO crash story and cover-up conspiracy beliefs.