My primary research is in the area of abstract
homotopy theory, specifically questions involving (monoidal) model
categories, Quillen equivalences, Bousfield localization,
cellularization, algebras over (colored) operads, and coalgebras over
comonads. My work has applications to (stable) homotopy theory, higher
category theory, equivariant homotopy theory, Goodwillie calculus,
homological algebra, motivic homotopy theory, and representation
theory. My PhD thesis was
supervised by Mark Hovey
and my coauthors in homotopy theory have included Michael
, Donald Yau
, Javier Gutierrez, Gabriel Valenzuela, Daniel Bravo, Hiroyuki Nakaoka, Boris Chorny
have also done research in computer science and discrete mathematics.
Under the supervision of Danny
Krizanc, my Master's thesis
settled a conjecture involving autonomous agents
moving on a graph. I have supervised undergraduate research
in computer science on the structure of
graphs, R package development, and streaming algorithms for statistical inference.
I have begun to dabble in statistics, with two papers so far
focusing on statistical pedagogy, and several applied data analysis
papers written jointly with students. I have supervised undergraduate
research projects related to spatial econometrics,
genomic modeling, data-driven journalism, and epidemiology
(specifically, the opioid epidemic in Ohio).
I have done work in economics, with my co-author Olga Nicoara,
to create a game theoretic model for the collective action problem in
revolutions, with a particular focus on the rebellion in Ukraine.
I have a project in progress focusing on mass shooting data in the USA.
I am working on a book about data science. I also wrote a chapter about statistics for the book Data Science for Mathematicians, published by Taylor and Francis.
I am also an active contributor to MathOverflow.
- The User's Guide Project: Looking Back and Looking Forward, Journal of Humanistic Mathematics, Volume 10, Issue 1, pages 411 - 430, 2020.
- Statistics for Mathematicians, chapter in Data Science for Mathematicians, Taylor and Francis, 2020.
- Homotopical Adjoint Lifting Theorem, with Donald Yau, Applied Categorical Structures, Volume 27, Issue 4, 2019, pages 385-426. Available as arxiv 1606.01803.
- A Project Based Approach to Statistics and Data Science, PRIMUS, Volume 29, Issue 9, 2019, pages 997-1038. Available as arXiv:1802.08858.
- Arrow Categories of Monoidal Model Categories, with Donald Yau, Math. Scandinavica, 125(2), 185-198, 2019, available as arXiv:1703.05359.
- An Overview of Schema
Theory, The Graduate Journal of Mathematics, Volume 3, Issue 2, 2018, 37-59. Available as arxiv 1401.2651.
- Encoding Equivariant
Commutativity via Operads, with Javier Gutierrez, Algebraic and Geometric Topology, Volume 18, Number 5, 2018, 2919-2962. Available as arXiv:1707.02130.
- Bousfield Localization and Algebras over Colored Operads, with Donald Yau. Applied Categorical Structures, Volume 26, Issue 1, 2018, pages 153-203. Available as arXiv 1503.06720.
Structures on Commutative Monoids in General Model Categories. Journal of Pure and Applied Algebra, Volume 221, Issue 12, 2017, pages 3124-3168. Available as arXiv 1403.6759.
- Curriculum Guidelines for
Undergraduate Programs in Data Science, with Richard De Veaux, et al.
Report from Undergraduate Faculty Group at Park City Mathematics
Institute, Annual Review of Statistics, Vol. 4, 2017, pages 15-30. Available as arXiv:1801.06814.
- Baez-Dolan Stabilization via (Semi-)Model Categories of Operads, with Michael Batanin. In Interactions between Representation Theory, Algebraic Topology, and Commutative Algebra, ed. Dolors Herbera, Wolfgang Pitsch, and Santiago Zarzuela, Research Perspectives CRM Barcelona, Volume 5, 2015, pages 175-179. Birkhauser, DOI 10.1007/978-3-319-45441-2.
- The User's Guide Project:
Giving Experiential Context to Research Papers, with Cary Malkiewich,
Mona Merling, Frank Lucas Wolcott, and Carolyn Yarnall. Journal of Humanistic Mathematics, volume 5, number 2, 2015.
- A user's guide: Monoidal Bousfield localizations and algebras over operads, Enchiridion: Mathematical Users Guides, Vol. 1, 2015. Available as arXiv:1801.03191.
- A Rational Choice Model of the Rise of Self-Proclaimed States Encompassed in Weak Post-Soviet Economies, with Olga Nicoara. 2015 Annual Meetings of the Public Choice Society.
- Monoidal Bousfield Localization and Algebras over Operads, Wesleyan University Library, 2014.
of Infinite Graphs with Random Local Orientations, Wesleyan
2012. Available digitally through WesScholar,
or as arxiv
- White Paper Research Report
(title is classified), Internal
NSA Journal, Division R6,
Investigation into the
Structure of Digroups (with
A. Magyar, K. Prifogle, and W. Young), Proceedings
of the Wabash Summer
Institute in Algebra,
- Homotopy theory of algebras of substitudes and their localisation, with Michael Batanin, arXiv:2001.05432, submitted.
- Left Bousfield Localization without Left Properness, with Michael Batanin, arXiv:2001.03764, submitted.
- Comonadic Coalgebras and left Bousfield Localization, with Donald Yau, available as arXiv:1805.11536.
- Smith Ideals of Operadic Algebras in Monoidal Model Categories, with Donald Yau, available as arXiv:1703.05377.
- Homotopy Theory of Homotopy Functors, with Boris Chorny, submitted, available as arXiv:1805.05378.
- Right Bousfield Localization and Eilenberg-Moore Categories, with Donald Yau. Available as arXiv:1609.03635.
- Left Bousfield Localization and Eilenberg-Moore Categories, with Michael Batanin. Submitted. Available as arXiv:1606.01537.
- Right Bousfield Localization and Operadic Algebras, with Donald Yau. Submitted. Available as arXiv:1512.07570.
Alternative Approach to Equivariant Stable Homotopy Theory, with
Mark Hovey, submitted. Available as arXiv:1312.3846.
Bousfield Localization and Algebras Over Operads, submitted. Available as arXiv:1404.5197.
Colimits in Various Categories of Manifolds, December 2012.
- Model Structures on non-Reduced Operads and the Commutative Monoid Axiom, with Michael Batanin.
- Model structures on operads and algebras from a global perspective, with Michael Batanin.
- Derived localisation and the Grothendieck construction, with Michael Batanin.
- Localization and Cellularization for Motivic Symmetric Spectra, with Carles Casacuberta.
- A short note on smallness and
- The Random
Basic Walk on Infinite Graphs.
- Parallel Search on Intersection Graphs, with Jessica Tang.
- Model structures for the relative stable module category, with Daniel Bravo and Gabriel Valenzuela.
- Abelian Left Bousfield localization, with Daniel Bravo.
- On multiplicative norms, with Hiroyuki Nakaoka.
Research I have supervised
- An Overview of Spatial Econometrics, Alex Tybl, arxiv 1605.03486 and Social Science Research Network (SSRN) number 2778679.
- Using Genomics to Predict Learning Disabilities, Trevor Masters.
- Parallel Search on Intersection Graphs, with Jessica Tang.
- Data Driven Journalism and the Opioid Epidemic (2019), with Lin Ma and Lam Tran.
- Streaming Statistical Tests (2019) with Colin Smith.
Ideas for Undergraduate Research
- Pedagogical Practice Projects Grant, Inviting Data Analytics Majors into Introductory Computer Science, Denison University, fall 2019.
- Center for Teaching and Learning, funding for Pedagogy and Resilience reading group, Denison University, 2019-2020.
- Pedagogical Practice Projects Grant, SAGE Labs in Calculus, Denison University, spring 2017.
- Center for Teaching and Learning, funding for Teaching Statistical Concepts reading group, Denison University, 2016-2017.
- Pedagogical Practice Projects Grant, Statistical Modeling, Denison University, spring 2016.
- Center for Mathematics and Scientific Computation, Equivariant cellularization and nullification, co-Principal Investigator with Boris Chorny, funding for research visit in July 2015.
- Denison University Research Table Grant, Ethics in Cyber Space,
co-Principal Investigator with Joan Krone and John McHugh. Funding for
interdisciplinary research, undergraduate research, developing
pedagogy, and to bring several external speakers to campus in 2015-2016.
- Project NExT Fellow, 2015-2016.
- National Science Foundation, East Asia and Pacific Summer
Institutes for U.S. Graduate Students (EAPSI): "Studying the Interplay
between Localization and Categorical Algebra via Algebraic Topology,'' Principal
Investigator, award number IIA-1414942.
Funded to be a visiting scholar at Macquarie University working with
Michael Batanin. Additional funding provided by Australian Academy of
Graduate Student Travel Grant for travel to Joint Mathematics
Meetings, January 2014.
Science Foundation Travel Grant for Type Theory, Homotopy Theory,
and Univalent Foundations conference held in Barcelona, Spain,
- AMS Funding to start Graduate Student
Chapter at Wesleyan, 2013.
an undergraduate I was lucky to be part of two REUs, so I firmly
in the value of research for undergraduates. I maintain a list
of projects on which I would be happy to collaborate with
undergraduates and early graduate students in mathematics or computer
science. If you're interested in seeing this list please email me.
To Denison students: I will happily take on research students in
applied statistics at any time, ideally during the semester. For pure
mathematics or computer science, my research interests tend towards the
abstract. Thus, research with me will likely best serve students
interested in graduate school. For such students, the best time to do
research with me is during the summer after your sophomore year, or as
an independent study in your junior or senior year. The summer after
your junior year would be best spent at an REU, to best position
yourself for applying to graduate school.
A nice collection of open problems about popular games can be gleaned from this MathOverflow question.