Ion Ionescu was a Romanian mathematician and engineer. He was one of the founders of the Gazeta Matematica and contributed a remarkable number of articles and problems to the journal. One of these problems is now known as the Ionescu-Weitzenböck inequality. He is also famed as an engineer for building bridges.
Find out more at: https://mathshistory.st-andrews.ac.uk/Biographies/Ionescu/