 He was a member of the executive board of the Christian Democratic Appeal and organizations of various social and economic issues.For his contribution to the success of the company he worked and his efforts in various ICT and innovative ancillary, De Jager received the ICT Personality 2006 Award of interbranch ICT ~ Office.In October 2019, KPN announced that De Jager would step down as finance chief and will be replaced by Chris Figee.