Michael Handel Position: Researcher Lehman College (New York) e-mail: Michael.Handel@lehman.cuny.edu site: http://math.gc.cuny.edu/homepages/Handel.html Visiting IMI from January 17th to 23rd, 2010.Research interests: Dinamycal Systems Main recent publications: Feighn, Mark; Handel, Michael Abelian subgroups of ${\rm Out}(F_n)$. Geom. Topol. 13 (2009), no. 3, 1657--1727 Franks, John; Handel, Michael Global fixed points for centralizers and Morita's theorem. Geom. Topol. 13 (2009), no. 1, 87--98 Farb, Benson; Handel, Michael Commensurations of ${\rm Out}({\rm F}_n)$. Publ. Math. Inst. Hautes Études Sci. No. 105 (2007) Advanced Course (January 18-23, 201): (Relative) mapping class group techniques in surface dynamics