**Research Interests:**

My main research interests are in topological dynamics, set theory, and topology. A current CV can be found here.

**Papers:**

with Alan Dow: “Small cardinals and small Efimov spaces,” submitted. (pdf)

with Neil Hindman: “Factoring a minimal ultrafilter into a thick part and a syndetic part,” submitted. (pdf)

with Andreas Blass, Jörg Brendle, Joel David Hamkins, Michael Hardy, and Paul Larson: “The rearrangement number,” submitted. (pdf)

“Universal flows and automorphisms of *P*(ω)/fin,” to appear in *Israel Journal of Mathematics.* (pdf)

with Jörg Brendle and Joel David Hamkins: “The subseries number,” to appear in *Fundamenta Mathematicae*. (pdf)

“Three conditionally convergent series, but not four,” to appear in *Bulletin of the London Mathematical Society*. (pdf)

with Nate Ackerman: “Indivisible sets and well-founded orientations of the Rado graph,” to appear in *Mathematical Logic Quarterly*. (pdf)

with Jonathan Meddaugh and Brian Raines: “Shadowing is generic on dendrites,” *Discrete and Continuous Dynamical Systems – Series* *S* **12**, no. 8 (2019), pp. 2211-2220. (link)

“Which subsets of an infinite random graph look random?” *Mathematical Logic Quarterly* **64**, iss. 6 (2018), pp. 478-486. (link)

“Abstract omega-limit sets,” *Journal of Symbolic Logic ***83** (2018), pp. 477-495. (link)

with Piotr Oprocha: “Ultrafilters and Ramsey-type shadowing phenomena in topological dynamics,” *Israel Journal of Mathematics ***227** (2018), pp. 423-454. (link)

“Ideals and idempotents in the uniform ultrafilters,” *Topology and its Applications ***237** (2018), pp. 53-66. (link)

with James Kelly and Tim Tennant: “The specification property and infinite entropy for certain classes of linear operators,” *Journal of Mathematical Analysis and Applications ***453** (2017), pp. 917-927. (link)

with Jonathan Verner: “G-delta and co-meager semifilters,” *Fundamenta Mathematicae ***235** (2016), pp. 153-166. (link)

with Mike Mislove: “Every infinite group can have a non-measurable subgroup,” *Topology and its Applications ***210** (2016), pp. 144-146. (link)

“Ramsey shadowing and minimal points,” *Proceedings of the American Mathematical Society ***144** (2016), pp. 2697-2703. (link)

“On neight,” *Topology Proceedings ***47** (2016), pp. 1-18. (link)

with Jonathan Meddaugh and Brian Raines: “Chain transitivity and variations of the shadowing property,” *Ergodic Theory and Dynamical Systems ***35**, no. 7 (2015), pp. 2044-2052. (link)

“P-sets and minimal right ideals in **N***,” *Fundamenta Mathematicae* **229** (2015), pp. 277-293. (link)

with Arnie Miller: “Partitions of 2^ω and completely ultrametrizable spaces,” *Topology and its Applications* **184** (2015), pp. 61-71. (link)

“Completely ultrametrizable spaces and continuous bijections,” *Topology Proceedings* **45** (2015), pp. 233-252. (link)

“Preservation and destruction in simple refinements,” *Topology and its Applications* **178** (2014), pp. 236-247. (link)

with Mike Mislove: “From Haar to Lebesgue via domain theory,” in *Horizons of the Mind: a tribute to Prakash Panangaden*, eds. F. van Breugel et. al., Lecture Notes in Computer Science, Springer, 2014. (link)

with Chris Good, Robin Knight, and Dave McIntyre: “Finite intervals in the lattice of topologies,” *Order ***31**, iss. 3 (2014), pp. 325-335. (link)

with Jan van Mill and Rolf Suabedissen: “Homogeneity and generalizations of 2-point sets,” *Houston Journal of Mathematics* **40**, 3 (2014), pp. 885-898. (link)

“The Toronto problem,” *Topology and its Applications* **162** (2014), pp. 76-90. (link)

“A cardinal invariant related to cleavability,” *Topology and its Applications*** 160** (2013), pp. 412-420. (link)

“Non-well-founded extensions of **V**,” *Mathematical Logic Quarterly ***159**, iss. 3 (2013), pp. 167-176. (link)

**Slides from Talks:**

*Universal automorphisms of P*(ω)/fin, BLAST, Denver CO, 2018 (slides)

*Factoring a minimal ultrafilter into a thick part and a syndetic part*, 2018 Summer Conference on Topology and its Applications, Bowling Green KY (slides)

*Self-homeomorphisms of N*

** and their quotients*, 2018 Spring Topology and Dynamics Conference, Auburn AL (slides)

*Autohomeomorphisms of N**, Conference in honor of Gary Gruenhage’s 70th birthday, Auburn AL, 2017 (slides)

*About β N*, job interview talk, UNC Charlotte, 2017 (slides)

*Ramsey theory meets topological dynamics*, 2017 Spring Topology and Dynamics Conference, Jersey City NJ, 2017 (slides)

*Quotients of the shift map (for birds)*, Summer Conference on Topology and its Applications, Leicester UK, 2016 (slides)

*Quotients of the shift map (for frogs)*, Toposym, Prague, 2016 (slides)

*Ramsey-type results in topological dynamics*, AIMS conference, Orlando FL, 2016 (slides)

*Dynamics in N**, Baylor mathematics colloquium, Waco TX, 2015 (slides)

*Ultrafilters on semifilters*, Winter School in Abstract Analysis, Hejnice (Czech Rep.), 2015 (slides)

*Preservation under refinement*, International Conference for Topology and its Applications, Nafpaktos (Greece), 2014 (slides)

*Ramsey shadowing and recurrence*, Galway Topology Colloquium, Birmingham UK, 2014 (slides)

*Stone Duality, More Duality, and Dynamics in β N*, Oxford Analytic Topology Seminar, Oxford UK, 2014 (slides)

*Completely Ultrametrizable Spaces and Continuous Bijections*, 2014 Spring Topology and Dynamics Conference, Richmond VA (slides)