|Representing the United States|
|1948 London||C-2 10000 m|
|1948 London||C-2 1000 m|
At the 1948 Summer Olympics in London, he won two medals with Steven Lysak with a gold in the C-2 10000 m event and a silver in the C-2 1000 m events. A native of Yonkers, New York, Macknowski attended Columbia University and later became an insurance agent. He died on April 4, 2013, aged 91.
- "1948 Summer Olympics – London, United Kingdom – Canoeing" – databaseOlympics.com (Retrieved on April 27, 2008)
- Macknowski, Stephen. ""United States Social Security Death Index," index". FamilySearch. Retrieved 3 January 2015.
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