He became a farmer in 1841, when his father, a well-known farmer in the area, passed his farm down to John. John was able to add to the land and eventually owned more than of farmland. He became a surveyor and civil engineer early in his career. He became Marlboro Township's Assessor, holding the position for 26 years, having been continually re-elected. In 1848, he was elected as the first Freeholder of the Township of Marlborough (now spelled Marlboro) and was instrumental in founding the Township, on February 17, 1848, when it was formed from parts of Freehold Township. He became the Superintendent of the Monmouth County public schools, from 1850 to 1863, and then became Associate Judge of the
New Jersey Court of Common Pleas and Quarter Sessions for Marlboro, from 1874 to 1879. For ten years, he held the position of chairman of the Monmouth County Republican Committee and was treasurer for sixteen years. 1884 (in Chicago), and in 1888. In 1875, he was nominated as a Republican for the
New Jersey Senate to represent the Monmouth County district, but lost the election. Herbert and Aumack was the largest carriage factory in Monmouth County for ten years. He was treasurer and superintendent of the Monmouth County Plank-Road Company and director of other turnpikes in Monmouth County. He was also president of the Matawan propeller company. == Personal life ==