 NEW YORK, June 22, 2021 PRNewswire -- NASDAQ: MDCA MDC Partners Inc. MDC Partners or the Company announced today that Mark Penn, Chairman and CEO, will present at the upcoming Sidoti Virtual Investor Conference from 9:15-9:45 AM ET, Wednesday, June 23, 2021. A live, audio webcast of the event will be available to the public in the Investors section of the MDC Partners website, mdc-partners.com. 