Dov Yehuda Shachat was a Chabad communal activist in Toronto who corresponded with the Rebbe over many years. No reliable published biography is available; the summary below is drawn from the letters themselves.
The Rebbe's letters to him concern Chabad activity in Toronto: organizing Agudas Chabad and Nshei uBnos Chabad there (IK 4317); starting a shul and study hall in a growing Jewish neighborhood (IK 3485); a farbrengen, a Nshei Chabad gathering and spreading the wellsprings (IK 4968); and the joy and merit of many women taking part in a good deed (IK 3572). Other letters discuss the farbrengen of Chai Elul, with blessings for the new year (IK 1211); the status of the secular sciences according to Tanya, and natural instincts (IK 3784); and the yahrzeit and birthday of the Mitteler Rebbe (IK 10281).
See also: Women – Nshei uBnos Chabad and women's organizations; Leadership – Leading and organizing communal work.