I am currently the Research Manager of the Biomedical and Clinical Informatics Lab at the University of Michigan, under the direction of Kayvan Najarian. Previously, I was a Ph.D. student at The Graduate Center, CUNY; as well as the Infrastructure Manager of the Westport Public Schools.

My research interests are in theoretical computer science, with a focus on machine learning, cryptography, and computational group theory, and well as computational medicine and computer networking/network security.



  1. J. Gryak, D. Kahrobaei, The Status of Polycyclic Group-Based Cryptography: A Survey and Open Problems, Groups Complexity Cryptology, De Gruyter, Volume 8, Issue 2, 171--186 (2016)

Preprints and Submitted Articles

  1. J. Gryak, R. Haralick, D. Kahrobaei, Solving the Conjugacy Decision Problem via Machine Learning, Submitted (preprint)
  2. J. Gryak, D. Kahrobaei, C. Martinez-Perez, On The Conjugacy Problem in Certain Metabelian Groups, Submitted (preprint)


  1. J. Gryak, Solving Algorithmic Problems in Finitely Presented Groups via Machine Learning, City University of New York, April 2017