 He is known for influencing the careers of such artists as James King, Donald Gramm, Jeannine Altmeyer, Benita Valente, John Reardon, Louis Quilico, Jean-François Lapointe, Judith Blegen, Cynthia Hoffmann, and Thomas Moser.Singher has also been the teacher of world-famous baritones such as Thomas Hampson and Rodney Gilfry.He wrote a book useful to vocalists aspiring to an operatic career, "An Interpretive Guide to Operatic Arias