Around 1850, Munro moved to Halifax and taught natural philosophy and mathematics at the Free Church Academy. He eventually became the school's principal before leaving for New York City in 1856. Five years later in 1861, he joined the publishing firm Irwin P. Beadle and Company. In 1863 the firm broke up and Munro entered in a partnership with Beadle and ended up owning the company a year later.
Munro became affluent from his publishing company and in 1879 began donating to Dalhousie University under the influence of his brother-in-law, a member of the university's Board of Governors. At the time Dalhousie's total income was only $6,600, and the university was in danger of shutting down. Munro donated the institution a total of $333,000 (about $8 million in today's money), which included endowed professorships and bursaries.
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