Tobias Wrigstad
Professor in Computing Science at Uppsala University
© 2026. All rights reserved.
Matt Johnson from the Pyrona team will be presenting our Python library for Behaviour-oriented Concurrency at PyCon US 2026! It uses sub-interpreter-based parallelism, and will make use of immutability for performance.
Andrea’s (student of Eva Darulova) paper on studying the use of floating point numbers in real-world code has been accepted to OOPSLA 2026. A preprint is available.
We have revamped Python Enhancement Proposal 795: Deep Immutability. Discussions here.
I am speaking at PLISS – Programming Languages Implementation Summer School in May 2026. Registration is open. I will be speaking about our work on data-race free Python and data-race free Java.
Together with Eva Darulova, I am opening two positions for postdocs and PhD students! Apply here for PhD position and here for a postdoc position.
The new website for the Programming Languages and Software Engineering Lab is up.
I will give a keynote presentation at Erlang 2025 in Singapore on our recent work on adding immutability to Python.
Our paper Decoupling Isolation and Concurrency: An Actor-Centric View of Behaviour-Oriented Concurrency appeared in Concurrent Programming, Open Systems and Formal Methods – Essays Dedicated to Gul Agha to Celebrate His Scientific Career.
Python Enhancement Proposal 795: Deep Immutability is up. Discussions here.
Fridtjof presenting our work on dynamically checked, region-based ownership at PLDI’25.
My recently graduated PhD student Marina’s last paper for her PhD won the Reviewers’ Choice Award at Programming 2025.
On May 14, we are presenting our proposal for fearless concurrency in Python at the Python Language Summit 2025 in conjunction with PyConUS 2025.
Our paper on dynamic region ownership for concurrency safety has been accepted to PLDI 2025.
Elias’ (and my) PhD student Beatrice Åkerblom just successfully defended her thesis: On Typeability in Programming Languages. The opponent was Christoph Reichenbach from Lund University, and the grading committee consisted of Stefan Marr from University of Kent, UK, Tatjana von Rosen from Stockholm University, SE, and Paris Carbone from the Royal Institute of Technology, SE. 
Elias’ (and my) PhD student Beatrice Åkerblom just nailed her thesis: On Typability in Programming Languages. The defense will take place on March 20th. 
I will give a keynote presentation at VIMPL in Prague on our recent work on Data-Race Free Python.
Dr. Albert Mingkun Yang successfully defended his thesis Design and Implementation of Temperature-Aware Garbage Collectors. The opponent was Professor Richard Jones from University of Kent, and the grading committe consisted of Professor Laurie Tratt from King’s College London, Professor Martin Elsman from University of Copenhagen and Professor Elisabeth Larsson from Uppsala University. 
My (recently graduated) PhD student Marina Shimchenko’s paper Monk — opportunistic scheduling to delay horizontal scaling, has been accepted for publication at PROGRAMMING 2025.