In Memoriam: Professor Nathaniel J. Szewczyk (January 28, 1973 – July 26, 2025)

npj Microgravity volume 12, Article number: 49 (2026) Cite this article

The international space life sciences community mourns the passing of Professor Nathaniel J. Szewczyk, an eminent scholar whose work bridged the gap between fundamental molecular biology and the practical challenges of long-duration human spaceflight. Nate was a driving force in establishing the nematode Caenorhabditis elegans as a high-fidelity model for understanding human disease and physiological adaptation to microgravity.

Nate’s academic leadership spanned world-class institutions. He held the Osteopathic Heritage Foundation Ralph S. Licklider, D.O., Endowed Professorship in Molecular Medicine at Ohio University (Ohio Musculoskeletal and Neurological Institute, OMNI), following a distinguished tenure as Professor of Space Biology at the University of Nottingham. His foundational work was deeply rooted in his time at NASA Ames Research Center, where he played a pivotal role in one of the most extraordinary chapters of space biology.

Following the tragic atmospheric breakup of the Space Shuttle Columbia (STS-107) in 2003, Nate, alongside Dr. Catharine A. Conley and their colleagues, identified and recovered live C. elegans from the wreckage1. This profound discovery, documented in their seminal paper, “Caenorhabditis elegans survives atmospheric breakup of STS-107, space shuttle Columbia”, proved the resilience of life and the viability of the nematode as a robust model for space research.

Building on this legacy, Nate and Dr. Michel Viso (CNES) organized the International Caenorhabditis elegans Spaceflight Experiment 1 (ICE-First) in 20042.- This mission marked the beginning of a lifelong partnership between Nate and myself (A.H.)3,4. He provided dedicated support to researchers from many countries—including myself, from Japan, as well as from Canada, France, and beyond—by assisting with the preparation of C. elegans ICE-first samples in Toulouse, France, transporting and retrieving the samples to and from the Soyuz spacecraft, and the subsequent analyses.

Nate’s mentorship also fostered the careers of many, including that of Tim Etheridge – his first postdoctoral researcher5,6. In Molecular Muscle Experiments 1 and 2, Nate and I (T.E.) acted as Co-PI’s. Centered around the UK Space Agency, we led space experiments aiming to understand and prevent health decline during spaceflight using nematodes, in collaboration with numerous researchers from the UK, US, Greece, South Korea, Japan, and China7,8,9,10,11,12,13. Together, this international team spent decades advancing our u