In March 1999 Maestro Walter Proost made a most successful debut with the prestigious Royal Philharmonic Orchestra in London. The orchestra promptly appointed him regular guest conductor for the coming seasons. Maestro Proost meanwhile led a series of concerts in the U.K., e.g., at Royal Albert Hall in London.

At his debut at the “ Großer Musikvereinssaal“ - the Golden Hall - in Vienna in March 1998, Maestro Proost experienced an overwhelming success. This orchestra since then invited him back to Vienna for a yearly guest appearance.

Since 2013 he is artistic director and chief conductor of the European Philharmonia.
In 2013 he had the honour of conducting the only two concerts given in the Benelux by the world-famous tenor Placido Domingo.’

Maestro Proost was invited by Maestro Giancarlo Menotti to conduct 2 concerts at his famous “Festival of Two Worlds” in Spoleto.

As one of its regular guest conductors from the Symphony Orchestra of the Slovenian Radio & Television in Ljubljana (RTV Slovenija); he had the pleasure to conduct a concert that was live broadcasted by the EBU (European Broadcasting Union) in 14 European countries, as well as in the U.S.A., Canada and Japan.

He led the “Teatro Lirico di Cagliari” in a live concert for the German radio station “Bayerische Rundfunk” in Munich. It included about 300 performers in the “Messa di Requiem in memoria di Pier Paolo Pasolini”. Maestro Proost was also frequently performing with the “Orchestra Filarmonica Italiana” in Piacenza; they gave a prestigious concert at the Vatican in Rome, on the occasion of the celebration of the Holy Year.

His brilliant international career is still expanding and leads him to guest conducting the San Remo Symphony Orchestra - of which he was appointed Music Director and Chief Conductor.

Walter Proost’s guest appearances brought him throughout the United States, South America, the Far East; he conducted the Seoul Philharmonic in Korea and the Nagoya Philharmonic in Japan.