In 1979, he was enrolled for a Masters Degree at Nairobi University where in graduated in 1981 with an MA in Urban and Regional Planning. Peter also holds a Post Graduate Diploma in Housing, Planning and Building from the International Institute for Housing Studies (Netherlands) and a Post Graduate Diploma in Urban Survey and Human Settlement from ITC-Netherlands.

In the public sector, he has worked for the City Council of Nairobi as a Town Planner where he rose through the ranks to become the Director of City Planning. With the formation of the new Ministry of Nairobi Metropolitan Development, he was elevated to become the Director of planning and Environment for the Nairobi Metropolitan Region which covers an area of 32,000 sq kms.

In the Ministry, he has overseen the preparation of Nairobi Metropolitan Region Spatial Plan which is already finalised. In the field of spatial planning he has a bias towards human settlements and urban regeneration.

Outside the public sector, he undertakes part time lecturing at the University of Nairobi.
Peter is a fellow member of Architectural Association of Kenya and a fellow member of the Kenya Institute of Planners. He is also a board member of the Physical Planners Registration Board and a Governing Council member of Kenya Institute of Planners.

Peter is widely travelled.