From "History of Grant County, Wisconsin", 1881, p. 1009.
TOWN OF HAZEL GREEN
J. L. JENCKES, physician and surgeon, Hazel Green; born in Rhode Island in 1816; came to Wisconsin 1848, and settled in Oshkosh, and engaged in the practice of medicine; in 1852, he removed to this village, and has been here since; he received his medical education at Pittsfield, Mass., and Providence, R. I. Married Eleanor J. Smith, a daughter of Rev. Hugh Smith, D. D., of New York City; they have four children - Hugh Lawrence, Daniel B., Eleanor Lawrence and Jessie. Are members of the Episcopal Church.
[I am not related to this family. I'm posting this as a service and hope it helps!]