Peter taught in secondary schools in New Zealand and England for 14 years, including six years as Head of Mathematics at Glenfield College, Auckland. He spent two years at the Cook Islands Teachers College as lecturer in Mathematics Education and has been a lecturer in Mathematics Education at the Faculty of Education since 1987, except for a year spent at Palmerston North Teachers College. He has co-authored 17 mathematics textbooks published in four countries plus an innovative series of 12 booklets published in the United States.

Peter is currently involved in:

• Lecturing in Mathematics Education
• Co-ordination of National Secondary Numeracy Project
• Training in-school facilitators in Mathematics for the Auckland Region
• Co-ordination of an Effective Numeracy Teaching (Pasifika) Project
• Consultant in Numeracy for the Manurewa Enhancement Initiative