[1] In 1842, Reimann's father established a grocery business and a vinegar manufactory in Copenhagen.
Shortly thereafter, Reimann gave up his job at the sugar refinery to assist his father in the family business.
The mother's death in 1846 left the father unable to continue the business, leaving the son with full responsibility for the operations.
In 1873, he resigned from the Bank of Denmark to become one of the directors of the newly founded Københavns Handelsbank, alongside National Bank governor Wilhelm Sponneck (1815–88) and State Debt Director Martin Levy.
She was the daughter of grocer (høker) and later proprietor of Hotel Tre Hjorter Niels Jacobsen (c. 1787–1849, previously married Bolette Nielsdatter, ca.1771–1822 in 1819) and Cecilie Kirstine Larsen (1803–43).