David Carchedi, Assistant Professor of Mathematics

I am an assistant professor of mathematics at George Mason University.

I completed my PhD in 2011 under the supervision of Ieke Moerdijk at Utrecht University, in the Netherlands. My thesis title was "Categorical Properties of Topological and Differentiable Stacks."

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Curriculum vitae


I co-organize the Topology, Arithmetic, and Dynamics Seminar at GMU together with Sean Lawton.

I'm proud to be a faculty mentor to GMU's chapter of the Association for Women in Mathematics (AWM). Here is a picture from the Professional Development Event for Aspiring Mathematicians which I suggested and helped organize:

Me, Cigole Thomas (treasurer), Ratna Khatri (president), Marilyn Vazquez


A central theme of my research is applications of higher category theory to topology and differential and algebraic geometry. In particular, I am interested in derived geometry. I also maintain an active interest in field theory.

I am currently involved in many different research projects.

One of the larger endeavors I am working on is an active collaboration with Dima Roytenberg centered around modeling derived manifolds using differential graded manifolds. I am also working with Hiro Tanaka on extended these ideas to the infinite dimensional setting, and with Owen Gwilliam on applications to field theory.

I have also been working in the field of étale homotopy. In particular, I am collaborating with Elden Elmanto on a project concerning a Galois-equivariant étale realizaton functor in motivic homotopy theory.

Finally, I have been working in the field of log geometry with Sarah Scherotzke, Nicolo Sibilla, and Mattia Talpo. We are currently investigating log étale K-theory.

I have many other projects as well.


Published Papers

1. Higher Orbifolds and Deligne-Mumford Stacks as Structured Infinity Topoi. Memoirs of the American Mathematical Society (Accepted) arXiv link

2. Kato-Nakayama spaces, infinite root stacks, and the profinite homotopy type of log schemes with Scherotzke S., Sibilla N., and Talpo M. Geometry & Topology (to appear) arXiv link

3. On The Homotopy Type of Higher Orbifolds and Haefliger Classifying Spaces. Advances in Mathematics, Volume 294, 14 May 2016, Pages 756–818 arXiv link

4. Correction to the article : An étalé space construction for stacks. Algebraic & Geometric Topology 16(1):541-546, February 2016

5. On Theories of Superalgebras of Differentiable Functions. Theory and Applications of Categories, Vol. 28, 2013, No. 30, pp 1022-1098. with Roytenberg D.

6. An Étalé Space Construction for Stacks. Algebraic & Geometric Topology 13(2):831-903, 2013

7. Compactly Generated Stacks: A Cartesian closed theory of topological stacks. Advances in Mathematics, Volume 229, Issue 6, April 1 2012, Pages 3339-3397 arXiv link


On the étale homotopy type of higher stacks

Homological Algebra for Superalgebras of Differentiable Functions with Roytenberg D.

Étalé Stacks as Prolongations

Sheaf Theory for Étale Geometric Stacks

Additional Material

Informal notes about Étale stacks I wrote for Alan Weinstein: A Quick Note on Étale Stacks

PhD Thesis



Math 114 Calculus II GMU, sections 4 and 5 (current)

Math 629 Algebraic Topology I GMU (spring 2017)

Math 649 Category Theory GMU (fall 2016)

Math 631 Graduate Topology GMU (spring 2016)

Math 321 Abstract Algebra GMU (fall 2015)

Math 101 (Calc II), Sec. 205 (UBC 2015)

Master's Course on Topos Theory (University of Bonn 2013)


I was a visiting scientist as the Max Planck Institute for Mathematics during the summers of 2016 and 2017.

I was a postdoc with Kai Behrend at the University of British Columbia from 2014-2015.

I was a postdoc at the Max Planck Institute for Mathematics from 2011-2014.

I was a Visiting Scholar at UC Berkeley from Jan.-May of 2014 with Alan Weinstein.

I was a Visiting Scholar at MIT during the summers of 2009, 2010, 2012, and 2013.

Before starting my PhD at Utrecht, I spent a year in Utrecht as a participant in the Master Class in Symplectic Geometry from 2006-2007.

I also participated quite a bit in the Master Class in Calabi-Yau Geometry from 2008-2009.

In Fall of 2002, I was a participant in the "Math in Moscow Program."


                                                                                    ©2013 David Carchedi     ©2013 Smoking Hen Studios