14 November 2026Sto lat!Gratulerer med dagen!Happy birthday!

Greg is
forty.

Physicist, CTO, co-founder, Lion, and the man who has measured how stiff a single cell is. Today we celebrate Grzegorz Brzezinka.

Blow out the candles

The story so far

From nanometres to neural networks.

Few people have gone from poking living cells with an atomic force microscope to running the technology side of a Norwegian-Polish consultancy. Greg has.

🔬

The physicist

Studied and did research at the Jagiellonian University in Kraków. He co-authored papers on the nanomechanics of endothelial cells, using an AFM tip to measure how cells stiffen and soften.

Kraków
🧪

The teacher

At university he ran "Nature = adventure" science shows and workshops, joined the physics students' club, worked with the University for Children, and led the students of his year.

Science for everyone
🚀

The CTO

CTO and co-owner of Prosit, building systems, data platforms, AI and security with teams in Norway and Poland.

Prosit
🧠

The AI researcher

Still publishing, now on language models. His recent papers ask whether Polish LLMs like Bielik know what they don't know.

AI / ML

Greg by the numbers

Forty years, measured properly.

A physicist deserves precise numbers. These are approximate, but the significant figures are right.

0
days on the planet
0
million seconds, give or take
0
trips around the sun, all completed
∞
great ideas left to build

Make a wish

Forty candles. Blow them out.

Click the candles one by one, or take a deep breath and do them all at once.

40 candles still burning

A few words

To my partner in Prosit.

Greg, building Prosit together with you has been one of the best things I've done. You bring the depth of a scientist, the curiosity of someone who still runs science shows for kids, and the calm of a man who knows how the systems really work.

Thank you for everything so far, and for everything we still have to build. Sto lat, my friend!

— Per Henning