.  Mark is the vice president of the Boston Marathon Quarter Century Club, an exclusive club for those who have completed at least 25 consecutive Boston Marathons.  Mark has an additional streak, which is quite unique-he holds the Boston Marathon record for running fifteen consecutive Boston Marathons with a cow heart valve.  After his open heart surgery in 2006, Mark competed in the Boston Marathon 11 weeks later.  Mark is also a coach and offers lots of wisdom and advice on training and running the Boston Marathon.  Mark is the proud coach and founder of the Erika’s Lighthouse Chicago Marathon Charity Team, which raises money to fund Erika's Lighthouse (https://www.erikaslighthouse.org/get-involved/ways-to-give/donate-now/), a nonprofit that is dedicated to addressing elementary, middle school, and high school mental health.  Mark asked us to mention that he has charity spots for several marathons, including Chicago, for those interested in running in support of Erika's lighthouse.