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Adam Johansen

@adamjohansen

Professor of Statistics at University of Warwick; computational methods, Monte Carlo, gradient flows and fun things like those.

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18.11.2024
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Latest posts by Adam Johansen @adamjohansen

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๐Ÿ“ข Applications for the Summer Research Experience at Warwick Statistics is now open!

The Summer Research Experience (SRE) is an 8 week programme taking place in July and August for students not currently at Warwick.

24.02.2026 14:27 ๐Ÿ‘ 1 ๐Ÿ” 2 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

The cover letter needs to show two things:
Your motivations for applying to the role.
Using examples, how you meet the essential and desirable criteria detailed in the job description.

It's often helpful to address each criterion in turn.
No other documents are needed.

10.01.2026 23:46 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Congratulations to Jenning Lim on a successful defence of his thesis, "Particle Algorithms for Inference of Probabilistic
Models" today, a well deserved success! And thanks to @chris-nemeth.bsky.social and Theo Damoulas for acting as examiners.

03.12.2025 21:17 ๐Ÿ‘ 10 ๐Ÿ” 2 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0

Congratulations to Fernando Zepeda on their viva today at @warwickstats.bsky.social; I spent a very enjoyable afternoon with @louisaslett.bsky.social discussing Fernando's thesis, "Non-Reversible Extensions of the ALPS Methodology for Multimodal and Transdimensional Sampling".

26.11.2025 21:31 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Student Researcher, 2026 โ€” Google Careers

๐Ÿ”ฅ WANTED: Student Researcher to join me, @vdebortoli.bsky.social, Jiaxin Shi, Kevin Li and @arthurgretton.bsky.social in DeepMind London.

You'll be working on Multimodal Diffusions for science. Apply here google.com/about/career...

15.11.2025 17:23 ๐Ÿ‘ 29 ๐Ÿ” 14 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Assistant Professor x2 (104176-1125) - University of Warwick Title: Assistant Professor x2 (104176-1125). Application Deadline: . Position Type: Permanent

Two assistant prof. vacancies at Warwick Statistics: warwick-careers.tal.net/vx/appcentre... (deadline 25 January 2025 at 11:55pm). CSML applications very welcome!

14.11.2025 21:01 ๐Ÿ‘ 7 ๐Ÿ” 6 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Dr. Shishen Lin has joined us as a Research Fellow on the ERC Synergy OCEAN project from September. His research is in learning in games, black-box optimisation and evolutionary algorithms. He is also interested in reinforcement learning and its combination with evolutionary computation methods.

05.11.2025 11:35 ๐Ÿ‘ 4 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Research Associate/Assistant in Statistics at Newcastle University Apply for the Research Associate/Assistant in Statistics role on jobs.ac.uk, the top job board for academic positions in higher education. View details and apply now.

Postdoc, Newcastle University (UK).

PINCODE researches Monte Carlo Fusion methods: this postdoc will help developing #rstats packages that bring this methodological work to life, as well as opportunities to contribute to further methodological development.

www.jobs.ac.uk/job/DOZ807/r...

22.10.2025 11:49 ๐Ÿ‘ 7 ๐Ÿ” 5 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

The Annual General Meeting (AGM) of the RSS CSML will take place on 2 December, 12:00โ€“13:00 (UK time) via Zoom. The meeting is open to all and will review the sectionโ€™s activities from the past year, outline plans for the year ahead, and present the committee for 2026.

16.10.2025 12:29 ๐Ÿ‘ 1 ๐Ÿ” 1 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Applications are invited for Chapman Fellow in Mathematics (Statistics Section) at the Department of Mathematics.
Closing date: 11 November 2025
www.imperial.ac.uk/jobs//search...

09.10.2025 11:51 ๐Ÿ‘ 0 ๐Ÿ” 4 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Thinking about doing a PhD in statistics, probability or mathematical finance? Want to learn more about doctoral training at Warwick Statistics? Register now for our upcoming PhD Open Days. Find more information and book your place here: warwick.ac.uk/fac/sc...

08.10.2025 13:29 ๐Ÿ‘ 0 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Imperial College London Authentication - Stale Request

We are hiring!

We are inviting applications for the Chapman Fellowship inย Statistics at Imperial College London.

This is a kind of super-postdoc: 3 years contract, excellent working conditions, and candidates are expected to propose an independent research plan.

www.imperial.ac.uk/jobs//search...

01.10.2025 12:39 ๐Ÿ‘ 7 ๐Ÿ” 4 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
Rocco Caprio

Congratulations to Rocco Caprio -- thesis defended, minor corrections done and graduation imminent. Thanks to Gareth Roberts and Andrew Duncan for examining the thesis. Rocco is now a Prob-AI-funded research fellow warwick.ac.uk/fac/sci/stat... and I look forward to seeing what comes next.

25.09.2025 14:58 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

There are a couple of vacancies in Wollongong for Maths/Stats lecturers:

www.uow.edu.au/about/jobs/j...

23.09.2025 08:03 ๐Ÿ‘ 3 ๐Ÿ” 4 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Some fun news: We're hiring!

Lectureship (analogous to Assistant Prof.) in Statistical Science and AI, in the School of Mathematics, University of Bristol.

Closing date 13 October 2025; link below!

www.bristol.ac.uk/jobs/find/de...

22.09.2025 13:28 ๐Ÿ‘ 18 ๐Ÿ” 20 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Screenshot of blog post at https://dirk.eddelbuettel.com/blog/2025/09/09#rcppsmc_0.2.9 describing release 0.2.9 of CRAN package RcppSMC

Screenshot of blog post at https://dirk.eddelbuettel.com/blog/2025/09/09#rcppsmc_0.2.9 describing release 0.2.9 of CRAN package RcppSMC

RcppSMC 0.2.9 on CRAN: Maintenance
Sequential Monte Carlo / Particle Filters for R
dirk.eddelbuettel.com/blog/2025/09...
#rstats #rcpp

09.09.2025 20:44 ๐Ÿ‘ 1 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

An announcement, which might be of some interest:

In the period 2022-2024, myself and a number of other postdocs on the "CoSInES" and "Bayes4Health" EPSRC grants were involved in organising a number of internal tutorial workshops, on topics relevant to researchers in computational statistics.

02.09.2025 12:13 ๐Ÿ‘ 17 ๐Ÿ” 5 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Rocco explains this work, among other things, about 90 minutes in to the [https://www.youtube.com/watch?v=QrPy49eAe9o](recording of the recent RSS Workshop of Gradient Flows).

07.08.2025 16:13 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

As evidence that this prediction wasn't too bad, [https://academic.oup.com/biomet/advance-article/doi/10.1093/biomet/asaf061/8223075](Rocco's second paper), showing the fast convergence of the venerable EM algorithm using a rather fun functional analysis argument, is in press for Biometrika.

07.08.2025 16:11 ๐Ÿ‘ 4 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Applications are still open for another two weeks.

06.08.2025 19:22 ๐Ÿ‘ 2 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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OCEAN OCEAN is an ERC Synergy grant gathering researchers to lay the fundations of the next-generation machine learning algorithms, involving decentralized inference and predictive tasks in the presence โ€ฆ

If anyone is, or knows anyone who is, looking for a postdoc position to work on the foundations of scalable inference and such... applications for a postdoctoral position at Warwick as a part of the OCEAN project (oceanerc.com) are open until 20th August at warwick-careers.tal.net/vx/appcentre....

23.07.2025 10:27 ๐Ÿ‘ 9 ๐Ÿ” 5 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1
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New work on inference for partially observed (hypoelliptic) SDEs in frequentist/Bayesian regimes.

Splitting schemes & controlled SMC (+ bridges) to recover the (pseudo)likelihood of interest
arxiv.org/abs/2507.14535

Work led by Shu, with @adamjohansen.bsky.social and @bayesianstats.bsky.social

22.07.2025 15:09 ๐Ÿ‘ 10 ๐Ÿ” 3 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 1
Nested sampling and SMC: numerical experiments โ€“ Statisfaction - I canโ€™t get no

Second blog post about nested sampling: numerical experiments;
https://statisfaction-blog.github.io/posts/30-06-2025-nested-sampling-experiments/

01.07.2025 06:46 ๐Ÿ‘ 3 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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็”˜ๅˆฉ ไฟŠไธ€ ๆ „่ช‰็ ”็ฉถๅ“กใŒใ€Œไบฌ้ƒฝ่ณžใ€ใ‚’ๅ—่ณž ็”˜ๅˆฉ ไฟŠไธ€ๆ „่ช‰็ ”็ฉถๅ“ก๏ผˆๆœฌๅ‹™๏ผšๅธไบฌๅคงๅญฆ ๅ…ˆ็ซฏ็ทๅˆ็ ”็ฉถๆฉŸๆง‹ ็‰นไปปๆ•™ๆŽˆ๏ผ‰ใฏใ€ไบบๅทฅใƒ‹ใƒฅใƒผใƒฉใƒซใƒใƒƒใƒˆใƒฏใƒผใ‚ฏใ€ๆฉŸๆขฐๅญฆ็ฟ’ใ€ๆƒ…ๅ ฑๅนพไฝ•ๅญฆๅˆ†้‡Žใงใฎๅ…ˆ้ง†็š„ใช็ ”็ฉถใŒ่ฉ•ไพกใ•ใ‚Œใ€็ฌฌ40ๅ›ž๏ผˆ2025๏ผ‰ไบฌ้ƒฝ่ณž๏ผˆๅ…ˆ็ซฏๆŠ€่ก“้ƒจ้–€ใ€€ๅ—่ณžๅฏพ่ฑกๅˆ†้‡Ž๏ผšๆƒ…ๅ ฑ็ง‘ๅญฆ๏ผ‰ใ‚’ๅ—่ณžใ—ใพใ—ใŸใ€‚

Shunichi Amari has been awarded the 40th (2025) Kyoto Prize in recognition of his pioneering research in the fields of artificial neural networks, machine learning, and information geometry

www.riken.jp/pr/news/2025...

20.06.2025 13:26 ๐Ÿ‘ 35 ๐Ÿ” 12 ๐Ÿ’ฌ 2 ๐Ÿ“Œ 0
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We are recruiting! A three-year postdoctoral position at Warwick as part of the โ€œProbabilistic Artificial Intelligenceโ€ hub on the mathematical foundations of AI. Further details at the link: warwick-careers.tal....

26.06.2025 11:00 ๐Ÿ‘ 4 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

๐Ÿฅณ Congratulations are in order for:

our newly promoted professors

FX
Robin
Paul
Terry

as well as for our newly promoted Associated Professors

Tom H
Alex D
Takoua
Emma
Brieuc

18.06.2025 09:53 ๐Ÿ‘ 5 ๐Ÿ” 3 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
A simpler nested sampling identity โ€“ Statisfaction - I canโ€™t get no

Post blog on an attempt of giving a simple introduction to NS (nested sampling), and NS-SMC (SMC samplers based on NS):

https://statisfaction-blog.github.io/posts/04-06-2025-simpler-nested-sampling-identity/nested.html

13.06.2025 06:41 ๐Ÿ‘ 4 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

I'm sure this will be the first of many.

12.06.2025 11:36 ๐Ÿ‘ 5 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1
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Towards Adaptive Self-Normalized Importance Samplers The self-normalized importance sampling (SNIS) estimator is a Monte Carlo estimator widely used to approximate expectations in statistical signal processing and machine learning. The efficiency of S...

๐Ÿšจ New paper: โ€œTowards Adaptive Self-Normalized ISโ€, @ IEEE Statistical Signal Processing Workshop.

TLDR;
To estimate ยต = E_p[f(ฮธ)] with SNIS, instead of doing MCMC on p(ฮธ) or learning a parametric q(ฮธ), we try MCMC directly on p(ฮธ)| f(ฮธ)-ยต | (variance-minimizing proposal).

arxiv.org/abs/2505.00372

02.05.2025 13:29 ๐Ÿ‘ 31 ๐Ÿ” 11 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Announcing our 2025-26 William Guy Lecturers

Announcing our 2025/26 William Guy Lecturers ๐Ÿ“ข

Focusing on "Statistics and AI," these talks will inspire students about the role of statistics in our tech-driven world.

๐Ÿ”— Read more: rss.org.uk/news-publica...

03.06.2025 12:05 ๐Ÿ‘ 4 ๐Ÿ” 3 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 2