We mourn the passing of Prof. Hans A. Schuessler, an esteemed physicist in the Department of Physics and Astronomy at Texas A&M University, USA, who passed away at the age of 93. His presence illuminated the world of laser spectroscopy and atomic physics with brilliance and generosity, leaving an enduring legacy of scholarly excellence and mentorship.

Prof. Schuessler’s career was distinguished by groundbreaking research in the field of atomic physics and laser spectroscopy. He pioneered techniques relating to the on-line spectroscopy of short-lived isotopes, precise measurements of nuclear moments, and advanced spectroscopic methods such as highly charged ion spectroscopy and Wigner crystals.

With over 290 publications and about 5,000 citations, his intellectual footprint remains substantial. Since 2020, Prof. Schuessler had been a member of the Editorial Board of Optics. He had made indelible contributions to the development of the journal through his meticulous review process and guidance to young scholars.

Prof. Schuessler’s passing leaves a profound void in the broader physics community worldwide. His spirit lives on in the students he nurtured, the peers he inspired, and the knowledge he generously shared.

He is survived by his academic family, whose future work carries forward the torch he lit. We offer heartfelt condolences to them and honor a life devoted to scientific discovery, collaboration, and education.

Rest in Peace Professor Hans A. Schuessler († 2025).

Editors-in-Chief of Optics
Prof. Dr. Costantino De Angelis
Prof. Dr. Thomas Seeger

Optics Editorial Office