He continued his studies with Robert Anderson at the Southern Methodist University in Dallas, with Herman Verschraegen at the Royal Conservatory of Brussels, and with Odile Pierre at the Conservatoire de Paris where he graduated with a Prix d'Excellence.

Michiels prepared the choir for concerts and recordings, such as Beethoven's Ninth Symphony with the BRTN Philharmonic Orchestra Brussels, conducted by Alexander Rahbari.

Both in Bruges and in Wiesbaden a concert was performed by the choirs Cantores and Chor von St. Bonifatius, Michiels playing the organ and Dessauer conducting.

The concert in Bruges on 23 October 1999 was named Eeuw van zinloos Geweld (Century of meaningless violence) and expressed it in Maurice Duruflé's Prélude et Fugue sur le nom d'Alain, Jules Van Nuffel's In convertendo Dominus, Jehan Alain's Litanies, Rudolf Mauersberger's Wie liegt die Stadt so wüst, Gerald Hendrie's Exsultate from the sonata In praise of reconciliation, and Duruflé's Requiem.

[5] In their first concert in Bruges on 30 June 2001 they performed Théodore Dubois' Fiat Lux, William Lloyd Webber's Missa Sanctae Mariae Magdalenae, Allegro giocoso of Edward Bairstow, Duruflè's Toccata, Van Nuffel's Psalm 92 Dominus regnavit, and Max Reger's Hebbel-Requiem in the organ version of Max Beckschäfer.

[10] On 27 October he played works of Schumann, Olsson, Flor Peeters, Gaston Litaize, and Naji Hakim at the International Organist Festival in Turin.

[14] On 3 October 2012, he was the organist in the premiere of Colin Mawby's Missa solemnis Bonifatius-Messe, composed to celebrate the 150th anniversary of the choir Chor von St. Bonifatius in Wiesbaden, conducted by Dessauer.