Mey was active in a number of professional organizations and held offices in them. Circa 1931, he became vice-chairman of the Deutsche Glastechnische Gesellschaft (German Technical Glass Society). From 1931 to 1945, he was president of the Deutsche Gesellschaft für technische Physik (German Society for Technical Physics). During the period 1933 to 1935, he was the president of the Deutsche Physikalische Gesellschaft (Acronym: DPG; translation: German Physical Society.). With Mey being elected president of the DPG during the year that Adolf Hitler became Chancellor of Germany, as opposed to the Nobel Laureate Johannes Stark, who was a supporter of the anti-Semitic Deutsche Physik, the DPG asserted its independence from slavishly following National Socialist policies.