John Marius Rodenburg FRS is emeritus professor in the Department of Electronic and Electrical Engineering at the University of Sheffield. ^{[3] [4]} He was elected a Fellow of the Royal Society (FRS) in 2019 for "internationally recognised... work on revolutionising the imaging capability of light, X-ray and electron transmission microscopes". ^[5]

Rodenburg was educated at University of Exeter where he was awarded a Bachelor of Science degree in Physics with Electronics. He moved to the Cavendish Laboratory ^[6] to complete his PhD on the detection and interpretation of electron diffraction patterns which was awarded by the University of Cambridge in 1986. ^[7]

Rodenburg worked until 1999 in the University of Cambridge as a University Research Fellow of the Royal Society. ^[8] He is currently emeritus professor in the Department of Electronics and Electrical Engineering at the University of Sheffield. ^[9]

His research interests have mostly been in improving the resolution and other capabilities of electron, X-ray and optical microscopy by processing diffraction patterns instead of using lenses. He has innovated many key developments in the diffractive imaging method called ptychography. ^{[10] [11] [12] [13] [14] [15] [16]}

In 2006, Rodenburg co-founded Phase Focus Limited, which uses ptychography to image live cells to improve cancer drug design. He served as a director and Chief Scientific Officer from 2006 to 2015. ^{[1] [17] [18] [19] [13]}

Rodenburg was elected a Fellow of the Royal Society (FRS) in 2019.

Rodenburg is married to the material scientist Professor Conny Rodenburg, ^[20] and is the brother of the voice coach and writer Patsy Rodenburg ^[21]