Applied Physics B - Helmut Lotsch turned 90 years old in 2023
Electrical engineer and father of Applied Physics in Springer celebrates his birthday. Dr. Lotsch is the founding editor of the Applied Physics journal, which was later divided into Applied Physics A and Applied Physics B.
Please find here his Editorial of the 50th Anniversary of Applied Physics
https://de.wikipedia.org/wiki/Helmut_Lotsch
https://www.optica.org/en-us/history/biographies/bios/helmut_k_v_lotsch/