text: After finishing school, Hammond began working at Howe & Leeds Wholesale West India Goods Store on Boston's Long Wharf. The same year, he became a clerk with J. W. Blodgett & Co.
  Hammond attended the Massachusetts Institute of Technology as a special student on the chemistry of paper manufacturing.
  After moving to Maine part-time, in 1853 he accepted a position at his uncle Samuel Dennis Warrens S. D. Warren Paper Mill in Cumberland Mills. By 1857, he was superintendent, a role in which remained for five years. His next position was as the mills agent.
  In 1874, Hammond and Warren bought the rights to Yarmouth Paper Company, in Yarmouth, Maine, at the towns Third Falls. They renamed it Forest Paper Company. Beginning with a single wooden building, the facility expanded to ten buildings covering as many acres, including a span over the Royal River to Factory Island. Two bridges to it were also constructed. In 1909, the year following Hammonds death, it was the largest such mill in the world, employing 275 people. Hammond also worked at the S. D. Warren mill until 1876, before transferring full-time to Yarmouth as the manager of the new business. The mill became known as a pioneer in the processing of soda pulp.
  Hammond retired from active business on January 1, 1906.