Subsequently he worked as a researcher at LMU until 1995 and then held different visiting professorships in Europe and the United States until he joined the faculty of the National University of Singapore in 2003.
[8] He also derived an inequality by which the visibility of interference fringes in interferometer experiments sets an upper bound on the which-way information available.
[10] He is co-author of frequently cited reviews on cavity quantum electrodynamics[11] and on mutually unbiased bases.
[12] He edited and published Symbolism of Atomic Measurements[13] based on lecture notes by Julian Schwinger, which has been called „a delight and a wonderful resource to a theoretical physicist“ and judged to come as close as possible to the „definitive textbook“ on quantum mechanics that Schwinger had intended to write.
[14] In 2015, Englert was inducted as a fellow of the American Physical Society for "distinctive theoretical contributions to the foundations, interpretation, and applications of quantum mechanics".