Mikael Vejdemo-Johansson

Mikael Vejdemo-Johansson (pronounced like Michael Vey-demo Johansson).

As of the Fall semester, 2016, I am Assistant Professor of Data Science at the mathematics department of CUNY College of Staten Island.

As of the Spring semester, 2017, I am Doctoral Faculty in the PhD program in Computer Science at the CUNY Graduate Center. Since 2019 I have been Deputy Executive Officer for the joint PhD in Computer Science and MSc in Data Science programs.


If you are a student, please use Mikael.VejdemoJohansson@csi.cuny.edu. All other inquiries, please use mvj@math.csi.cuny.edu. My office on CUNY College of Staten Island, Willowbrook campus, is 1S-208. At the Graduate Center, my office is 4319.02. I prefer contact by email over contact by telephone.


My main area of interest is in applied algebraic topology and topological data analysis: how to compute the shape of a data set, and how to use that shape to understand the underlying data.

A large collection of lecture slides, written papers and other information can be found on my CV website.

I have helped create several software packages for persistent homology, most recently JavaPlex.

I am chair of the coordinating committee of the ATMCS conference series.

Among my many side projects is an enumeration of possible tieknots. To go with this paper, I wrote a webpage with a random tieknot generator.



Here are incomplete lists of students I have worked with either to advise thesis projects or to supervise independent studies.

Thesis Students

  • Denis Khryashchev (GC), PhD, Partially monotonic correlation coefficients
  • Hannah Aizenman☥ (GC), PhD, Topological Data Visualization
  • F19 Shweta Garg (GC), MSc, Spatial Data Analysis
  • Leo Carlsson☥ (KTH), PhD 2021, Applied Machine Learning in Steel Process Engineering
  • João Frederico Carvalho☥ (KTH), PhD 2020, Topological Methods For Motion Prediction And Caging
  • Martina Scolamiero☥ (KTH), PhD 2015, Invariants for Multidimensional Persistence
  • Timothy Sweeney, BSc 2017, A Study of Taxi-Cab Driver’s Times between Trips

☥ means I was/am co-advisor.

Independent Studies

  • F22 Alisa Leshchenko, Mathematical Statistics with Statistical Software
  • F22 Miao Qin Xie, Data Science in Python
  • F22 Denis Gostev (GC), Spatial Data Analysis
  • F19 David Angeles, Joshua Higgins, Bayesian Data Analysis


Spring 2023

Fall 2022

  • MTH229: Calculus Computer Laboratory
  • HON223: Macaulay Honors Seminar on Science and Technology of New York

Spring 2022

Fall 2021

  • HON223: Macaulay Honors Seminar on Science and Technology of New York

Spring 2021

  • MTH113: Introduction to probability and statistics with computer applications

Fall 2020

  • HON223: Macaulay Honors Seminar on Science and Technology of New York

Spring 2020

Fall 2019

  • HON223: Macaulay Honors Seminar on Science and Technology of New York

Spring 2019

Fall 2018

Spring 2018

Fall 2017

Spring 2017

Fall 2016


I have a simmering interest in mathematical art, especially using laser cutters, 3d printers and other modern small-scale manufacture techniques.

I exhibited at the Joint Mathematics Meetings 2020.

I exhibited in the group show Mathematical Beauty at the AAAS Gallery.

I exhibited at the Joint Mathematics Meetings 2019.

I exhibited and gave an invited lecture at the Bridges Mathematical Art Conference 2018.

I exhibited at the Joint Mathematics Meetings 2012.

I am helping to launch the Illustrating Mathematics community. Currently the best place to get to know us is at our wiki.