I am the Graduate Chair for the Department of Mathematics, and am a Managing Editor of Homology, Homotopy and Applications.
My papers, preprints and talks.
Here are some photos from trips I have been on; I also have a Google+ page.
Contact information is below.
Research 
My research interests include algebraic topology
(especially stable homotopy theory and model categories),
homotopy type theory and univalent foundations,
derived categories,
modular representation theory,
mathematical physics (quantum gravity),
algebraic and scientific computation,
and category theory (especially higher categories).
My papers, preprints and talks. Research groupDan Christensen (faculty)James Richardson (Ph.D. student, Sept 2015 until present) Marco Vergura (Ph.D. student, Sept 2015 until present) Luis Scoccola (Ph.D. student, Sept 2016 until present) 
What's this? 
Chris Kapulkin and I are running a seminar on higher category theory this semester.
I am a coorganizer of a Mathematics Research Communities event on Homotopy Type Theory, from June 4 to 10, 2017 in Snowbird, Utah. This event is designed for people within about 3 years (before or after) of their PhD.
Chris Kapulkin, Rick Jardine and I organized a Workshop on Homotopy Type Theory and Univalent Foundations of Mathematics at The Fields Institute in May, 2016. I also coorganized a Workshop on Triangulated Categories at the Banff International Research Station in June, 2016.
I encourage eligible people apply for an NSERC Postdoctoral Fellowship, an NSERC Banting Postdoctoral Fellowship (domestic and international applicants eligible), any other NSERC postdoc, an NSF PDF (e.g. a International Research Fellowship Program postdoc, or a Mathematical Sciences Postdoctoral Research Fellowships or a Distinguished International Postdoctoral Research Fellowship), or similar to be held at Western.
The Canadian Government has many scholarships and fellowships that are available for people from many different countries.
Recent Teaching 
Winter 2018  Algebraic Topology, Math 4152b/9052b. 
Summer 2017  Mathematical Computation, Math 9171a. 
Winter 2017  Algebraic Topology, Math 4152b/9052b. 
Summer 2016  Representation Theory, Math 9140a. 
Other 
The Hopf archive
of research papers in topology.
The Front for the xxx Mathematics
Archive. Direct to the xxx archive.
The Ktheory archive.
MathSciNet, which contains
searchable reviews of almost all mathematics publications and many
physics publications as well.
SAGE is a wonderful program which interfaces to Magma, Maple, Mathematica and MATLAB, and the free programs Axiom, GAP, GP/PARI, Macaulay2, Maxima, Octave, and Singular. It is freely available and open source. If you find math fun, consider becoming a math major. Talk to me or anyone else in the department if you're curious. 

Contact information 
Dan Christensen
Department of Mathematics
The University of Western Ontario
London, Ontario N6A 5B7
Canada
Office phone: (519) 6612111 x86530
Fax: (519) 6613610 (include my full name)