During his student period he took lessons with many different musicians: Lee Konitz, Ben Street, Ben Monder, Chris Cheek, Mark Turner, Matt Penmann, Peter Bernstein, Nestor Crespo, David Horta, Jesse van Ruller, Arnold Dooyeweerd, Maarten v.d Grinten, John Ruocco and many others. After finishing his master he followed composition lesson in Amsterdam with master composer Pablo Escande. - Guillermo has produced more than 10 cd’s as a band leader and many more as a side man. – Guillermo Celano gives guitar and composition lessons in Amsterdam. – He is doing the programing of the BimLabs in het Bimhuis together with Monica Akihari. – He works for Trytone, a musicians collective with a programming and a record label. -Since March 2017 he is working as an adviser for the Nederlandse fonds voor de Podiumkunst. FPK.