He is also known for the Frei Test,[1] which was developed in 1925 for the detection of lymphogranuloma venereum (LGV).
[2] Wilhelm Siegmund Frei was born in Neustadt, Upper Silesia.
His father, Emil Frei, was a mining firm director, from Neustadt.
He met Magda Frankfurter (1885–1973) when they were both studying medicine in Freiburg and was married on 12 January 1912.
Due to the rise of the Nazis and bad times looming ahead in Germany, he immigrated to New York with his family[3] and went to work at the Montefiore Hospital in the Bronx from 1937 until he fell ill and died on 27 January 1943, leaving behind his wife and three children at the age of 58.