In the late 1990s he began working with Macmillan to develop a new range of learner’s dictionaries. The first of these, the Macmillan English Dictionary for Advanced Learners (or MEDAL), was published in 2002, with Michael as Editor-in-Chief. The first dictionary of its type to be created from scratch for almost ten years, MEDAL won both the Duke of Edinburgh/English Speaking Union English Language Book Award (2002) and a British Council Innovation Award (2004). Michael edited a second edition (2007) as well as developing and editing several related titles, including the Macmillan Phrasal Verbs Dictionary (2005) and the Macmillan Collocations Dictionary (2010). MEDAL went online in 2009 as macmillandictionary.com, and Michael continues as its Editor-in-Chief.