Was born in Ellsworth, Trumbull County, Ohio, October 18, 1815. He spent his youth in that locality, and commenced the study of medicine when eighteen years of age, and attended lectures at Jefferson Medical college, in Philadelphia, in the winter of 1833. He commenced practice in Ellsworth, and remained there some years. In 1836 he married Miss Harriet Carson, a cousin of the celebrated Kit Carson, the explorer. In 1847 he graduated in Cleveland Medical College, and removed with his family to Ashland. He opened an office, and continued to practice until 1849, when he caught the gold fever, and went to California, his family remaining in Ashland. He returned in 1851, and again engaged in the practice of medicine. In 1854 he again went to California, intending to remain several years, leaving his practice in the hands of his brother, Dr. Lawrence Kinnaman; but, a little more than a year after his arrival in California, learning the dangerous illness of his brother, he returned to attend him, but arrived a short time after his decease. He again engaged in practice, and continued until his last illness. In 1871, leaving his practice in the care of his son, Dr. R.C. Kinnaman, he went to California to recruit his failing health, and remained one summer, failing to receive any direct relief.
He returned and remained feeble, until July 18, 1874, when he deceased, at the residence of his son-in-law, Mr. Henry Carter, at Lancaster, Ohio. His remains were brought back and interred in the cemetery of Ashland.
Dr. Kinnaman was reticent, but frank and honorable in his profession. He was a member of the Ohio State Medical society, and also a member of the Academy of Natural Sciences, at Cleveland. He was an attentive student, and possessed an extensive knowledge of medicine. He left a large family.