[2] In 1990, he founded the magazine Polis – Zeitschrift für Stadt und Baukultur, where he serves as publisher and editor-in-chief.
[5][6] In the same year, he founded the publishing house Müller + Busmann GmbH & Co.
[2][7] Busmann founded the agency logos "Kommunikation und Gestaltung" in 1994.
[2] In 2002 Busmann became an appointed member of the German Academy for Urban and Regional Planning [de] (DASL)/NRW and in 2004 member and head of the Forum Marketing in the German Council of Shopping Centers [de]/ Ludwigsburg.
[2] He has been a member of the Board of Trustees of the Carl Richard Montag Förderstiftung [de] since 2005.