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05/15/2021 06:42 PM
Pennsylvania State Senate

Isaac Nathaniel Marselis

Photo credit:

Tintype Etching, George Bergner, 1858




Session Position District Party
1857 1 Democrat
1859 1 Democrat
 Counties   Philadelphia


1801 - 1875

Born March 21, 1801, Schenectady, New York, the son of Nicolaas and Machtelt (Rosa) Marselis; Dr. Marselis graduated from Union University, NY; received a Medical Degree from Univ. of Pennsylvania, 1825; appointed Philadelphia Port Physician, 1839-1844; member of the Select Council of Philadelphia; and was elected to the state Senate in 1857.  Although a Democrat, Marselis was a member of an 1850 mass meeting, pledging support for the Union but expressing dissatisfaction to the 1850 Compromise.  In Senate business, he introduced the bill to sell the state canal system to private business.  He married Rachel Knorr in 1824, the daughter of prominent Philadelphia physician, John Knorr.  He died on February 7, 1875.