He served in various positions of the movement's administrative staff since 1954, and as a personal secretary (along with Rabbi Binyomin Klein) and press director for the movement's leader, Rabbi Menachem Mendel Schneerson. He joined Schneerson's staff in 1952 as a driver. In 1956 Krinsky was called upon by Schneerson to join his personal staff, which was then headed by Rabbi Mordechai Aisik Hodokov.
At that time, Schneerson also appointed Krinsky to direct the Lubavitch News Service. In this capacity, he was in charge of disseminating the Rebbe's talks around the world via satellite. In 1988, Rabbi Schneerson appointed Krinsky to serve as sole executor of his will.
Many of the books were seized from the previous Rebbe, Rabbi Yosef Yitzchak Schneersohn, as part of a Soviet crackdown on religion after the Russian Revolution of 1917. Krinsky garnered the support of actor Jon Voight and politician Sam Brownback for this cause. Krinsky married Devorah Kasinetz, daughter of Rabbi Zev and Ethel Kasinetz.
Their children are:
Rabbi Hillel David Krinsky, who is married to Shterna Sarah Garelik, daughter of Rabbi Gershon Garelik, the head Lubavitcher rabbi in Milan, Italy. Menachem M. Krinsky, who is married to Miriam Turner of Chicago
Rabbi Shmaya Krinsky, who is married to Rivkah Gutnick, daughter of Australian commodities magnate Joseph Gutnick
Chana Krinsky, who is married to Rabbi Joseph Futerfas, director of Camp Gan Israel, New York
He appeared in several lists of influential American Jews, including the Forward 50 in 2005. From 2007 to 2013, Newsweek magazine compiled an annual list of the fifty most influential rabbis in the United States.
Krinsky's was nominated to the list each year. His placings varied from year to year, but he never dropped from the top five. 2007: 2nd place
2008: 4th place
2009: 4th place
2010: 1st place
2011: 1st place
2012: 2nd place
2013: 4th place.
Married Devorah Krinsky. Children: Sheine, Chana, David;children: Schmaya, Levi.