Hayo Boerema (1972) is organist in the St.Laurenskerk in Rotterdam. He has been a professor of improvisation at Codarts Conservatory in Rotterdam since 2010. Among his outstanding CD recordings are Alain and Messiaen albums. He is also active as a composer.
Stef Tuinstra (1954) is organist of the Nieuwe Kerk in Groningen and the Jacobuskerk in Zeerijp and church organist of the Martinikerk in Groningen. He is active as an organ consultant and published several articles on organ building and performance practice. Among his important recordings are Bach and Böhm albums.