| 2020 | Founder and board member EWF-Lab . Foundation |
| 2014 | Ambassador Earth, Wind & Fire |
| 2013 | PhD degree TU Delft Dissertation Earth, Wind & Fire – Natural Air Conditioning |
| 2007 | Principal Investigator Earth, Wind & Fire - Natural Air Conditioning TU Delft (until 2012) |
| 2005 | PhD Candidate TU Delft on the research Earth, Wind & Fire – Natural Air Conditioning |
| 2003 | Chairman TVVL Working Group “Ventilation and Smoking” (until 2005) |
| 2003 | Chairman Standards commission of “Climate control in Buildings” at the Dutch Institute of Standardization (until 2007) |
| 2002 | Chairman REHVA Taskforce “Ventilation and Smoking” (until 2005) |
| 2002 | Chairman REHVA Taskforce “Indoor Environment and Energy in Schools” (until 2005) |
| 2001 | Chairman REHVA REGION 1 - formerly REHVA Cooperation Group (until 2005) |
| 1998 | Pre-retirement – Establishment Bronsema Consult |
| 1996 | Member REHVA Cooperation Group on behalf of TVVL (until 2001) |
| 1995 | President Technology Council TVVL (until 2004) |
| 1993 | Permanent TVVL representative at ASHRAE (until 2002) |
| 1993 | Permanent TVVL representative at rehva (till 2012) |
| 1993 | Part-time visiting lecturer at TU Delft Faculty of Architecture (until 2007) |
| 1992 | Managing Director at Ketel/Deerns Consulting Engineers– Consulting Alliance Amsterdam Airport Schiphol (until 1998) |
| 1978 | Managing Director and Partner at Ketel Consulting Engineers BV Delft (until 1998) |
| (Projects a.o. Townhall Lelystad – Ministry of Housing The Hague Den Haag – Terminal 3 Amsterdam Airport Schiphol) |
| 1972 | Consulting Engineer at Adviesgroep Ketel en van Scheindelen Delft |
| 1967 | Managing Director at Geveke Warmtetechniek BV – Arnhem office |
| 1962 | Project Manager at Geveke Warmtetechniek BV - Amsterdam office |
| 1958 | Project Engineer at Geveke & Co’s Technisch Bureau – Amsterdam office |
| 1957 | Reserve Officer at Royal Army – Ordnance Corps |
| 1955 | Bachelor degree in mechanical engineering Groningen –Academie Minerva |
| 1935 | Born in Assen |