Mary Rebecca Long was a daughter of John L. Long and his wife Amanda "Nancy" (Sultzbaugh) Long, born in Wiconisco Township, Dauphin County, Pennsylvania, on 3 June 1866.
In the 1880 U.S. Census, Mary R. Long was 13 years old and living in the household of parents John L. and Nancy A. Long in Wiconisco Township. 
Mary was married to Milton H. Kocher in about 1887. They had one child, Vera, born in July 1888. The 1900 U.S. Census recorded Mary R. Kocher, age 30 and born in June 1866, and her husband Milton Kocher in Harrisburg Ward 9, Dauphin County, Pennsylvania. They had been married 12 years. Mary had borne one child, daughter Vera A. Kocher, born July 1888 and age 11. Others in the household were Tillie F. Long, identified as Milton's sister-in-law, born April 1880 and age 20; Harry W. Davis, boarder, born Oct. 1874 and age 25, and Malinda M. Davis, boarder (but she was Mary Kocher's sister), born May 1878.
The 1910 U.S. Census found Milton and Mary R. Kocher on 175 North 15th St. in Harrisburg. Milton was 45 and Mary was 43. He was working as a foreman in an ironworks. Other family members in the household were Harry A Sierer, son-in-law, age 22 and married 2 yrs, working as assistant foreman in an iron works; Vera A Sierer, daughter, age 22 and married 2 yrs, with one child, Mary M Sierer, 13 months. The family was keeping a boarding house. Nora H Stubblebine, 33, was recorded as housekeeper for the boarding house. Boarders were Charles W Grieff, 33 and a rail road yard master; William McCallister, 21, aviation company clerk; Clarence Thomas, 23, and Charles Pieffer, 32, both marble cutters in a marble works.
Milton Kocher died in 1911. Subsequently, Mary Kocher married George W. Clark of York County, Pennsylvania. 
Mary Rebecca Clark died on 5 November 1922 in New Cumberland (Cumberland County), Pennsylvania, at the home of her daughter, Vera Sierer. Cause of death was "cerebral apoplexy." George W. Clark of New Cumberland was the informant for the personal information on her death certificate. She was buried in East Harrisburg Cemetery. Her funeral was conducted by Reverend J. H. Schmitt, pastor of Trinity United Brethren Church. Pallbearers were her relatives Walter Kocher, Charles Grieff, Custer Wingard, Harry Davis, Raymond Fry, and Harvey Orman. Her death certificate gives her age at death as 55 years, 5 months, and 2 days, which is too young by 10 or 11 years; she was 65 or 66 years old.
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