In 1890 he received his "Semicha" (the Rabbinical Diploma) from Rabbi Isaac Hirsch Weiss of Vienna, author of "Dor Dor v'Dor'shav". He underwent a series of written and oral examinations, spending two months there "being rigorously examined". Singer had begun rabbinical studies with Dayan Jacob Reinowitz of the London Beth Din in 1879, [http://www.oztorah.com/2010/06/hermann-gollancz-the-title-of-rabbi-in-british-jewry/] eventually following a "demanding three-year course of study" with Weiss; he visited the Continent often and spent much time either with Weiss, or studying by himself under Weiss' guidance.