I work in the area of applied topology. This area operates at the interface of math, statistics, computer science, and engineering. My research program

  • Develops foundations for topological data analysis (TDA) by blending algebra and topology together with sheaf theory;
  • Studies analytic, geometric and combinatorial questions motivated by TDA;
  • Prompts interdisciplinary work and computational projects suitable for (under)graduate students.


Click here to view my CV. Updated April 29, 2022.

My Thesis

My PhD thesis developed the theory of sheaves and cosheaves with an eye towards applications. It is meant to be both a pedagogical introduction to the basics of sheaf theory as well as a source of new mathematics,  both pure and applied. It has been cited over 182 times and has been the subject of many study groups around the world. You can read it here:



  1. A Sheaf-Theoretic Construction of Shape Space with Shreya Arya and Sayan Mukherjee. 17 pages, 6 figures. Last Update: April 19, 2022.
  2. From Trees to Barcodes and Back Again II: Combinatorial and Probabilistic Aspects of a Topological Inverse Problem with Jordan DeSha, Adélie Garin, Kathryn Hess, Lida Kanari, and Brendan Mallery. 39 pages, 17 figures. Last Update: July 26, 2021.
  3. A Relative Theory of Interleavings with Magnus Bakke Botnan and Elizabeth Munch. 50 pages. Last Update: April 29, 2020.
  4. Functors on Posets Left Kan Extend to Cosheaves: an Erratum. 10 pages. Last Update: July 22, 2019.

Conference Papers and Abstracts

  1. A Lattice-Theoretic Perspective on the Persistence Map by Brendan Mallery, Adélie Garin, and Justin Curry. 4 pages, 2 figures. Accepted March 26, 2022 to the Young Researchers Forum (YRF) of the 38th International Symposium on Computational Geometry (SoCG 2022).
  2. The Universal ℓ^p-Metric on Merge Trees with Robert Cardona, Tung Lam and Michael Lesnick. 20 pages, 10 figures. Accepted February 9, 2022 to the 38th International Symposium on Computational Geometry (SoCG 2022).
  3. Sheaf Theoretic Models for Routing in Delay Tolerant Networks by Robert Short, Alan Hylton, Jacob Cleveland, Michael Moy, Robert Cardona, Robert Green, Justin Curry, Brendan Mallery, Gabriel Bainbridge, Zara Memon. 19 pages, 2 figures. Accepted November 16, 2021 to AeroConf 2022. Published March 9, 2022.
  4. Introducing Tropical Geometric Approaches to Delay Tolerant Networking Optimization by Jacob Cleveland, Alan Hylton, Robert Short, Brendan Mallery, Robert Green, Justin Curry, Devavrat Vivek Dabke, Olivia Freides. 11 pages, 10 figures. Accepted November 16, 2021 to AeroConf 2022. Published March 9, 2022.
  5. A Survey of Mathematical Structures for Lunar Networks by Alan Hylton, Robert Short, Jacob Cleveland, Olivia Freides, Zara Memon, Robert Cardona, Robert Green, Justin Curry, Sriram Gopalakrishnan, Devavrat Vivek Dabke, Brittany Story, Michael Moy, Brendan Mallery. 17 pages, 6 figures. Accepted November 16, 2021 to AeroConf 2022. Published March 9, 2022.

Journal Articles

  1. How Many Directions Determine a Shape and other Sufficiency Results for Two Topological Transforms with Sayan Mukherjee and Katharine Turner. 38 pages. Accepted on April 27, 2022 by the Transactions of the AMS (TAMS).
  2. Decorated Merge Trees for Persistent Topology with Haibin Hang, Washington Mio, Tom Needham and Osman Berat Okutan. 39 pages. Accepted on February 9, 2022 by the Journal of Applied and Computational Topology (JACT).
  3. Classification of Constructible Cosheaves with Amit Patel. 37 pages. Published by Theory and Application of Categories (TAC) on June 24, 2020.
  4. Moduli Spaces of Morse Functions for Persistence with Michael J. Catanzaro, Brittany Terese Fasy, Jānis Lazovskis, Greg Malen, Hans Riess, Bei Wang, and Matthew Zabka. 33 pages. Published online by Journal of Applied and Computational Topology (JACT) on June 27, 2020.
  5. The Fiber of the Persistence Map for Functions on the Interval. 19 pages. Published by the Journal of Applied and Computational Topology (JACT) on January 22, 2019.
  6. Dualities between Cellular Sheaves and Cosheaves. 32 pages. Published by the Journal of Pure and Applied Algebra (JPAA) on June 27, 2017.
  7. Discrete Morse Theory for Computing Cellular Sheaf Cohomology with Robert Ghrist and Vidit Nanda. 23 pages. Published by Foundations of Computational Mathematics (FoCM) on June 20, 2015.
  8. Topological Data Analysis and Cosheaves. 39 pages. Published by the Japanese Journal of Industrial and Applied Math (JJIAM) on June 18, 2015.

Survey Articles

  1. Euler Calculus with Applications to Signals and Sensing with Robert Ghrist and Michael Robinson. 71 pages. Published by Proceedings of Symposia in Applied Mathematics on February 1, 2012.
  2. Soliton Solutions of Integrable Systems and Hirota’s Method. 16 pages. Published by the Harvard College Mathematics Review (HCMR) Spring 2008.

Service Articles

  1. Mental Health in the Mathematics Community with Mikael Vejdemo-Johansson and Julie Corrigan. 6 pages. Published by the Notices of the American Mathematical Society in the August 2019 issue, Volume 66, Number 7, pp. 1079-1084.