Christoph K. Hitzenberger is Professor of Medical Physics (retired) at the Center for Medical Physics and Biomedical Engineering, Medical University of Vienna. He was Editor-in-Chief of Biomedical Optics Express 2016-2021 and presently serves as the Chair of the Board of Editors of Optica Publishing Group. He has worked in Biomedical Optics since 1987 and is one of the pioneers of low coherence ocular biometry and optical coherence tomography. Among his most important contributions to these fields were the introduction of the optical A-scan in 1990, the first demonstration of Fourier domain OCT methods in 1995, and pioneering work in polarization sensitive OCT since 2000. He is Fellow of Optica (formerly OSA) and of SPIE; his pioneering contributions to OCT were awarded with the Russ Prize of the US National Academy of Engineering in 2017 and with the Austrian Cross of Honour for Science and Art, First Class (2017).