Esteban Rangel joined the Computational Science (CPS) division at Argonne National Laboratory as a staff scientist in 2021. He became a postdoc at the Argonne Leadership Computing Facility (ALCF) after receiving his PhD in Computer Science from Northwestern University in 2018. He began contributing to the HACC codebase as a graduate student, where much of the work towards his PhD thesis was designing and implementing scalable analysis software for N-body cosmological simulations.