Twaalfhoven married Maria Somary in Zurich, Switzerland in 1954. The couple moved in 1955 to Town of Mount Royal, Montreal, Canada, where their first two children were born. A third child was born in 1958 while the family was living in Long Island, NY. Five more children were born after the family moved to The Netherlands. Twaalfhoven and his wife formed the first parent-teacher organizations in Noord Holland. Maria Somary dies at 7 February 2020.
Career in business
In 1957 Twaalfhoven worked on Wall Street, New York to gain experience in the financial industry. Using money inherited by his wife, he purchased a farm in Quebec with 120 cows. Twaalfhoven used the then unknown method of Artificial Insemination, and in five years raised cows that increased milk production by 100%. Twaalfhoven's sold the farm in 1958 and moved his family to Hilversum, The Netherlands, where he started a business, setting up the first laundromats in northwestern Europe. In 1993 Twaalfhoven received an honorary doctorate from the Fordham University for his achievements in the area of education and as an international entrepreneur. In 2001 he received the Annual Alumni Award from Harvard Business School for his activities stimulating entrepreneurship in Eastern and Western Europe. He has been a chairman of Harvard Business School Alumni. Through his company Indivers B.V., Twaalfhoven started 54 businesses in the countries Italy, France, Germany, Russia, Ukraine, Holland, Belgium, England, U.S.A., Singapore and China. Of these businesses, 17 failed. Twaalfhoven was the co-founder of the first venture capital company in The Netherlands, known as Gilde. Some of the businesses Twaalfhoven founded include:
Indivers B.V.
European Forum for Entrepreneurship Research
Aluminium Extruders Harderwijk - The Netherlands, Germany, Switzerland and Belgium
Ribby Dry Cleaning
Autowasserette - The Netherlands and Belgium
MIFA
Almax - The Netherlands, France, Italy, UK
Danvers Seals
Dayton Process
Elbar - Argentina, Boston, Hickham, The Netherlands, Poland, Singapore, Wood
Eldim - Boston, The Netherlands
Twaalfhoven published his own book, Learn Earn Return: The Journey of a Global Entrepreneur, in April 2013 through EFER.
Maps
Twaalfhoven is a collector of 16th, 17th and 18th century maps, and has donated 22 of these to Fordham University Libraries.