Mark Dowdle is a Saint Paul, Minnesota-based ultra-endurance athlete known for unique running challenges. He gained prominence for his "Calendar Club" project in 2023, where he ran approximately 5,767 miles (9,281 km).

Mark has completed multiple self-supported ultra-runs, including two charity runs from Springfield, Illinois, to St. Paul, Minnesota, raising roughly $100,000 for the Love Like Laurie foundation.

He also competes in events like the Beer Mile World Classic and sets Fastest Known Times.