He then engaged in teaching until he reached the age of twenty-nine. During the latter part of this period he pursued the study of medicine, and in 18(59 graduated from the Medical Department of the University of the City of New York. He immediately investigated the system of homoeopathy, and has since practiced it. His first year of practice was at Goshen, Orange County, N. Y. From thence he removed to Newton, Sussex County, N. J., and was the first to practice homu'opathy in that county. In 1875 he removed to Dobbs Ferry, which has since been his place of residence. He is a member of the Westchester County Homeopathic Medical Society, and was its president for two yeai-s. He has been four times married. His wives were Sarah and Anna D., both daughters of Elias Dayton, of New Jersey, and cousins of Hon. Wm. L. Dayton ; Emma, daughter of Steven Archer; and Ellen M., daughter of Rev. D. L. Marks, of the New York Conference. Of the children of Dr. Hasbrouck, his eldest son, Dayton, Avho died January 13, 1885, at the age of twenty four, was at the time of his death a member of the senior class of the New York Homoeopathic College. His surviving children are Edith S. and Mabel E., twin daughters, and an infant son, David Marks.

Although not a professional politician, he has always taken a deep interest in political affairs, and is ■especially interested in all that pertains to the welfare of the locality in which he lives. He has been for several years a member of the Board of Education of Dobbs Ferry, and is its present president. He is also health officer of the village, and president of the savings bank. He has been connected with the Republican party since its organization, and has always taken a deep interest in its success.