Having acquired experience as a piano technician and tuner in Germany, Denijs De Winter takes over the last piano factory in Belgium. In making piano restoration its main activity, the company becomes so successful that pianos are sent from across Europe, and are exported as far as the United States where he supplies distributors in Chicago and his own store in New York.

Attracted by the artistic, i.e. musical part of his craft, he founds his own company: Pianomobil, which specialises in rental and technical service for concerts. Thanks to this choice, he is invited to the most prestigious concert halls in the world: Royal Festival Hall in London, England - Tonhalle in Zurich, Switzerland - Teatro alla Scala of Milan, Italy - La Fenice in Venice, Italy - the Berlin Philharmonic, Germany - Carnegie Hall in New York City, United States - Avery Fischer Hall in New York City, United States - Musikverein in Vienna, Austria - Salle Pleyel in Paris, France - Suntory Hall in Tokyo, Japan - Symphony Hall in Osaka, Japan - Concertgebouw in Amsterdam, the Netherlands - Salle Wilfrid Pelletier in Montreal, Canada - National Arts Centre in Ottawa, Canada - Symphony Hall in Boston, United States - Severance Hall in Cleveland, United States - Orchestra Hall in Chicago, United States - Roy Thompson Hall in Toronto, Canada - Symphony in Birmingham, England - Beethovenhalle in Bonn, Germany - Palais des Beaux-Arts in Brussels, Belgium - Tivoli Konsertsal in Copenhagen, Denmark - Koncerthus in Gothenburg, Sweden.

He has worked for the piano elite in concert, such as Martha Argerich, Shura Cherkassky, Byron Janis, Chistoph Eschenbach, Leon Fleisher, Andrei Gavrilov, Friedrich Gulda, Zoltan Kocsis, Stephen Kovacevich, Alicia De Larrocha, Nikita Magaloff, Ivan Moravec, Leif Ove Andsnes, Maria Joäo Pires, Maurizio Pollini, Alfred Brendel, Radu Lupu, Ivo Pogorelich, Andre Watts, Mikhail Pletnev, Evgeny Kissin, Daniel Barenboim, Grigory Sokolov, Elton John, Keith Jarett, Chick Corea. 25 of whom were named "Great pianists of the 20th century".

He has also toured with such famous pianists as Jorge Bolet, Philippe Entremont, Vladimir Ashkenazy, Katia & Marielle Labeque, Hélène Grimaud, Oscar Peterson, Grigory Sokolov, Krystian Zimerman. He has prepared and furnished pianos to recording labels such as Deutsche Grammophon Gesellschaft, The Decca Record Company Ltd, Harmonia Mundi, BMG Classics, Erato, EMI Classics, Chandos, Channel Classics, Teldec Classics, Naïve, Mirare,Virgin Classics, et Naxos for recordings with Abdel Rahman el Bacha, Stephen Kovacevich, Zoltan Kocsis, Boris Berezovsky, Nikolai Lugansky, Andrei Vieru, Anne Queffélec, Brigitte Engerer, Piotr Anderszewski, Nicholas Angelich, Horacio Gutiérrez, Jorge Bolet, Jos Van Immerseel, Andreas Staier, Michel Dalberto, Giovanni Bellucci, Frank Braley, Hélène Grimaud, Myung Whun Chung, Krystian Zimerman, Christian Zacharias, Nelson Freire et Martha Argerich.

Radio and television broadcasters including the BBC, WRD, VRT, Radio France and France Culture as well as VPRO and AVRO also use his services. For over 20 years the Festival International du Piano de La Roque d'Antheron calls on him to supply top quality pianos to featured soloists. Piano builders including Yamaha in Hamamatsu, Fazioli in Venice, Bosendorfer in Vienna and Steinway & Sons in Hamburg and New York have invited him for technical exchanges.

His work and reputation have been widely covered by specialised publications and others, and he has given many interviews on the subject of his work to both radio and television. He has published on his craft in several specialised media. He is internationally renowned, and "considered, in the general opinion, as one of the three best in the world" (Le Figaro Magazine). Over the course of his career he has not only displayed a great passion for music, musicians, and the piano, but also a willingness to share this passion and his knowledge.