I am a Managing Editor of Homology, Homotopy and Applications.
My papers, preprints and talks.
Contact information is below.
Research 
My research interests include algebraic topology (especially stable homotopy theory and model categories), homotopy type theory and univalent foundations, category theory (especially higher categories), derived categories, modular representation theory, mathematical physics (quantum gravity), and computation.  
Research groupDan Christensen (faculty)Jarl TaxerÃ¥s Flaten (Ph.D. student, Sept 2019 until present) Lirong Yang (M.Sc. student, May 2021 until present) Karthik Boyareddygari (M.Sc. student, September 2021 until present) 
Group photo, July 2021 
Chris Kapulkin and I are running the Homotopy Type Theory Electronic Seminar Talks.
Graduate students: I am looking for new graduate students in the areas of homotopy theory, homotopy type theory and topology, broadly construed. If you are interested, please contact me and send an application to our department mentioning my name. To be sure your application can be evaluated fully, please have at least three people submit detailed letters of reference.
Postdocs: I encourage eligible people to apply for an NSERC Postdoctoral Fellowship, an NSERC Banting Postdoctoral Fellowship (domestic and international applicants eligible), any other NSERC postdoc, an NSF PDF, or similar to be held at Western. The standard NSF postdocs can be held in Canada, and there are other eligible NSF postdocs, e.g. an International Research Fellowship Program postdoc or a Mathematical Sciences Postdoctoral Research Fellowships.
Students and postdocs: The Canadian Government has many scholarships and fellowships that are available for people from many different countries.
Links:

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Recent Teaching 
Fall 2021  Mathematical Structures, Math 2155F. 
Summer 2021  Mathematical Computation, Math 9171a. 
Fall 2020  Mathematical Structures, Math 2155F. 
Winter 2019  Algebraic Topology, Math 4152b/9052b. 
Other 
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. Here are some photos from trips I have been on. 
I've produced plots of roots of polynomials, some of which appeared in a Scientific American article. 
Contact information 
Dan Christensen
Department of Mathematics
The University of Western Ontario
London, Ontario N6A 5B7
Canada
Office: MC130
Office phone: (519) 6612111 x86530
Fax: (519) 6613610 (include my full name)