sentences:  He was also appointed Docent in the Department of Geology, University of Helsinki, Finland in 1987.Through co-operation with Jürgen Ehlers, his interest in glaciation has led to the publication of seven books.Most recently they were joint co-ordinators of an INQUA Commission on Glaciation workgroup which compiled an atlas of world Quaternary glaciation limits (see below Ehlers & Gibbard, 2004 a, b, c).