His current research interests are focused on software evolution and program comprehension. He is best known for his more than decade-long work on using information retrieval and text mining techniques for software analysis to support various comprehension tasks during software evolution. Marcus received several Best Paper Awards and he is the recipient of the NSF CAREER award in 2009. Marcus gave more than 20 invited tutorials on the use of text retrieval techniques to support SE tasks at universities, companies, and summer schools. He was the Chair of the steering committee of ICSME and served on many conferences as chair and program committee member and also serves on the editorial board of three SE journals (TSE, EMSE, JSEP).