A Chicago man ran the Boston Marathon with a cow heart valve 11 weeks after open-heart surgery. 13 years later, he’s running for another milestone. – New York Daily News April 14, 2019 by Leo Cow heart-valve recipient Mark Buciak is out to become the first Illinois competitor to finish 40 straight Boston Marathons. Source: A Chicago man ran the Boston Marathon with a cow heart valve 11 weeks after open-heart surgery. 13 years later, he’s running for another milestone. – New York Daily News Darned impressive.