I am a PhD graduate of the Computer Science and Engineering department at the University of Washington. I graduated in the spring of 2019, and am currently a post-doctoral researcher at Kyoto University.

I worked in the PLSE group and I was advised by Dan Grossman. I’ve also collaborated with Emina Torlak.

I’m interested in using program analysis to solve practical software engineering problems and improving the soundness and precision of analyses on difficult-to-analyze, framework-based applications. My research vision is outlined in my SNAPL ‘17 paper.

My prior research has used static analysis to find consistency errors in programs that interact with dynamic execution environments, techniques from model checking to check for memory safety errors in Rust, dynamic taint analysis to find bugs in dynamic configuration update schemes, and type systems and program instrumentation to find type errors in Ruby programs. You can find links to all of my publications below, or look at my CV.

I received my BS in Computer Science at the University of Maryland, College Park. My honors project - which helped develop an undergraduate PL curriculum - was advised by Dr. Jeffrey Foster. I also had the pleasure of working with Dr. Michael Hicks.


Concerto: A Framework for Combined Concrete and Abstract Interpretation
John Toman and Dan Grossman. In POPL ‘19.
Paper (PDF) | ACM | GitHub | Web

Legato: An At-Most-Once Analysis with Applications to Dynamic Configuration Updates.
John Toman and Dan Grossman. In ECOOP ‘18.
Paper (PDF) | GitHub | Web | Artifact

Taming the Static Analysis Beast.
John Toman and Dan Grossman. In SNAPL ‘17.
Paper (PDF) | Web

Staccato: A Bug-Finder for Dynamic Configuration Updates.
John Toman and Dan Grossman. In ECOOP ‘16.
Winner: Distinguished Artifact Award and Distinguished Poster Award.
Paper (PDF) | GitHub | Web | Talk (YouTube) | Artifact

CRust: A Bounded Verifier for Rust.
John Toman, Stuart Pernsteiner, and Emina Torlak. In ASE ‘15.
Paper (PDF) | GitHub | Web

The Ruby Type Checker.
Brianna M. Ren, John Toman, T. Stephen Strickland, and Jeffrey Foster. In SAC ‘13.
Paper (PDF) | Web

Blog Posts