Arnaud Spiwack spend the first 10 years of his working life in Academia, between Chalmers university in Gothenburg, Sweden, and École Polytechnique, Inria, and Mines ParisTech, in the Paris area. He spent this time researching dependent types, computer-verified proof, and sequent calculus. During his time in Academia, Arnaud got involved in the development of the Coq Proof Assistant, where he, in particular, re-engineered Coq’s tactic engine and gave it an abstract interface. After leaving Academia, he remained a member of the core development team of the Coq Proof Assistant. He is now a senior architect at Tweag, and is working at making the world better typed.