2026

November

I will be giving a keynote at PyCon Sweden. Details will be announced soon.

October

We organised an OpenJDK hackathon on October 2nd. The hackathon was run by developers of OpenJDK from Oracle. 19 students attended.

September

Together with Mae Milano, Peter Müller, and Matthew Parkinson, I am organising a Dagstuhl seminar on Applications of Ownership and Capabilities to Concurrency and Memory Safety.

September

Luke’s paper When Behaviours Have to Happen: An Axiomatic Model of Causality in Behaviour-Oriented Concurrency was accepted for publication in CONCUR.

Paper Slides

August

Fred’s and my EuroPython presentation about immutability in Python is now up on YouTube.

Slides Presentation

July

Together with Donghee Na, Fridtjof and I will be speaking at the Python Language Summit 2026 about concurrency abstractions for Python, bocpy, PEP795, and our work on Lungfish.

Slides

June

I’m giving the keynote speech at ISMM 2026 in Boulder, Colorado.

Presentation

May

My student Fridtjof and I will be talking at EuroPython 2026 about “Immutability: Fast and Safe sharing of Data across Subinterpreters”. See you in Krakow 13-19 July!

April

Our paper on Dynamically Checked Deep Immutability in Python has been accepted to PLDI 2026.

Paper Presentation Artefact

February

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.

Presentation

February

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.

Paper

2025

December

We have revamped Python Enhancement Proposal 795: Deep Immutability. Discussions here.

December

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.

DRF Python DRF Java

December

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.

November

The new website for the Programming Languages and Software Engineering Lab is up.

October

I will give a keynote presentation at Erlang 2025 in Singapore on our recent work on adding immutability to Python.

Presentation

September

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.

Paper

June

Python Enhancement Proposal 795: Deep Immutability is up. Discussions here.

June

Fridtjof presenting our work on dynamically checked, region-based ownership at PLDI’25.

June

My recently graduated PhD student Marina’s last paper for her PhD won the Reviewers’ Choice Award at Programming 2025.

May

On May 14, we are presenting our proposal for fearless concurrency in Python at the Python Language Summit 2025 in conjunction with PyConUS 2025.

Slides

April

Our paper on dynamic region ownership for concurrency safety has been accepted to PLDI 2025.

March

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.

February

Elias’ (and my) PhD student Beatrice Åkerblom just nailed her thesis: On Typability in Programming Languages. The defense will take place on March 20th.

February

I will give a keynote presentation at VIMPL in Prague on our recent work on Data-Race Free Python.

January

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.

January

My (recently graduated) PhD student Marina Shimchenko’s paper Monk — opportunistic scheduling to delay horizontal scaling, has been accepted for publication at PROGRAMMING 2025.