**OUTLINE OF RESEARCH**

**RECENT CONFERENCE PRESENTATIONS**

- Workshop on Categorical Structures for Descent and Galois Theory,
Hopf Algebras, and Semi-abelian Categories. Fields Institute, Toronto,
September 23-28, 2002.
**Invited talk: "Galois groupoids and covering morphisms in topos theory"** - Workshop on Ramifications of Category Theory. Florence, Italy,
November 18-22, 2003.
**Invited talk: "Totally disconnected reflections in the homotopy theory of toposes"** - Union College Mathematics Conference. Schenectady, N. Y., November
8-9, 2004.
**Contributed talk: "Groupoids, locally paths simply connected toposes, and a van Kampen theorem"** - Categories in Algebra, Geometry and Mathematical Physics. Macquarie
University, Sydney, Australia, 11-15 July 2005.
**Invited talk: "An intrinsic characterization of branched coverings" (joint with J. Funk)** - International Conference: "Charles Ehresmann: 100 ans", Universite
de Picardie, Amiens, October 7-9, 2005.
**Invited talk: "On two non-discrete generalizations lof \pi_0"** - Canadian Math Society Summer Meeting 2006. Special Session on
Category Theory. University of Calgary, AB, Canada, 3-5 June 2006.
**Invited talk: "Michael toposes are comprehensive" (joint with J.Funk)** - Category Theory Octoberfest. University of Ottawa. October 21-22,
2006.
**Invited talk: "Quasi locally connected toposes" (joint with J. Funk)** - Canadian Math Society Winter Meeting 2007. Special Session on
Mathematical Applications of Category Theory. University of Western
Ontario, London, Ontario, Canada, December 8-10, 2007.
**Invited talk: "Fundamental Pushout Toposes"** - International Category Theory Conference CT2007. Carvoeiro, Portugal. June
17-23, 2007.
**Contributed talk: "Branched coverings of quasi locally connected toposes "** - International Category Theory Conference CT2008. Calais, France. June
22-28, 2008.
**Contributed talk: "Intrinsic n-stack completions " (Joint with C. Hermida)**

**SEMINARS AT THE CRTC MONTREAL**

- "Extensive 2-categories and Top". February 5, 2002.
- "A Van Kampen theorem for toposes and applications" February 12, 2002.
- "Locally constant objcets in a Grothendieck topos". February 19, 2002.
- "Stack completions rfevisited" October 29, 2002.
- "Johnstone's theorem and Fox completions" March 2, 2004
- "Michael cov erings are comprehensive" April 4, 2006
- "Locally discrete locales" January 23, 2007