The MTM – Master in the Teaching of Mathematics – program has been the oldest graduate program in the Department of Mathematics and Statistics of Concordia University, established in 1967, when Concordia was still the Sir George Williams University. Very quickly, however, the Department developed a Master of Science/Master of Arts in Mathematics program and, later, a PhD program in Mathematics. MTM survived about 50 years, until 2016 when admissions to the program were suspended, or until 2019 when the last MTM student graduated.
In this document, we describe the program, its mission, degree requirements and courses. We present the context of the program’s creation in 1967 and the reasons for its suspension 50 years later. 
We present also the people – faculty and students – who made the program what it was: a lively space for critical reflection on mathematics education research and practice, always open to trying novel approaches to teaching mathematics. 
The tradition of critical reflection and trying different approaches to teaching mathematics has a chance to survive in the department after the suspension of the MTM program; MSc/MA students have the option of doing their research in the area of mathematics education. 
The purpose of writing this historical piece is to keep the memory of the MTM program at Concordia alive, and to create an easily accessible reference for graduates of the program when they apply for jobs or further graduate studies.
The document has been written by the last director of the MTM program, Anna Sierpinska, with editorial help of her former student, Carol Beddard, an MTM 2012 graduate.