Heller's university teaching experience includes secondary math methods at Hunter College and calculus at Pratt Institute. (htf.gse.harvard.edu)
He has been employed as a maths teacher, maths methods tutor, school coordinator, curriculum developer, assessment designer and administrator, researcher and research manager. (teachermagazine.com.au)
This thread introduces the Singapore Maths method outlining how you might implement the programme in your school. (derventioeducation.com)