Born in Wilsonburg, West Virginia, he attended the public schools and graduated from Salem College in 1895.
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In 1890, Rosier was a teacher of the village school at Bristol, West Virginia and was principal of the public schools of Salem in 1891 and 1892; in 1893 and 1894 he was superintendent of schools of Harrison County, West Virginia and was a member of the faculty of Salem College from 1894 to 1896.
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