The Matrix Element Method was developed during Run I of the D0 experiment and its application to only a subset of the lepton+jets top quark sample yielded a significantly improved measurement of the top quark mass compared to other techniques. Consequently, the method was applied to both the D0 and CDF Run II data samples and the results contribute significantly to the striking precision of the current top mass world average. In this seminar, the concepts of the matrix element and results based on its application at both Tevatron experiments are presented.
