Personal Life
Apart from tennis, he was an amateur boxer and runner. He graduated at the Technische Hochschule of Charlottenberg earning a doctorate in engineering in 1929. He received the Reichsmedaille for winning the European Zone of the 1932 International Lawn Tennis Challenge. After moving to England he launched his own audio equipment company in 1935 in Kentish Town. In 1946-1949 he had five copyrighted patents related to plastic molding. His company, Truvox Engineering, was sold to Racal in 1969 for $1.26 million. In 1970 he founded Celestion Electronics, a loudspeaker manufacturer. He had several children, Oliver (b. 1939) later become a Wimbledon Junior Champion and competed in the main Wimbledon competitions as well. Oliver also took over the family enterprise in 1988 and runs the firm to this day. His another son John Allen Nicholas was a shareholder in Lacoste and as an avid supporter of tennis and squash he got Celestion involved into a racquet sponsoring venture, which ended in 2010. He's still interested in or owning a dozen companies. Daniel Prenn was inducted into the International Jewish Sports Hall of Fame in 1981.
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