Mikhail Tkach, also Michal Tkacz, Michael J. Tkach, and M. Nastivsky, born in Mastisiw, Poland, of Ukrainian parents, and arrived in the United States at New York City on November 25, 1909, under the name Michal Tkacz. Tkach's wife, Yeroslava, was born in Slatchev, Poland, and entered the U.S. in 1913. The Tkachs lived in New York City from 1922 onwards. Tkach became a naturalized U. S. citizen in New York City on December 8, 1936.