Julien is the Chief Science Officer and co-founder of Argent, famed for his blog series "WTF is Account Abstraction." A champion of making blockchain user-friendly, he's been pivotal in advancing account abstraction.

With a PhD in Physics focused on Quantum Information and Cryptography, Julien has numerous highly-cited publications. He founded SQR Technologies, acquired by ID Quantique, and later worked on IoT security at M2Mi before launching Argent in 2017.