Following comScore’s (NSDQ: SCOR) nearly $50 million acquisition of M:Metrics, co-founder, chief product architect and senior analyst Seamus McAteer said he is stepping down for personal reasons effective today, we have learned and confirmed. “I feel that I achieved what I set out to achieve with M:Metrics,” McAteer told us in an email. “If you looked at our first investor presentation before we launched the company, it had as a roadmap of everything that we did over the last four years. I also know that I have succeeded in a primary goal of making myself totally expendable. I built a team that included people who were much smarter than I am and Will and they are better equipped than me to help the business scale as part of a bigger company.” McAteer’s departure does not have anything to do with the layoffs the company conducted in June, a spokeswoman said. However, she would not confirm if McAteer was walking away from a $1 million in restricted stock that both he and M:Metrics’ CEO Will Hodgman received from comScore as incentive to stay at the company. Prior to starting M:Metrics, McAteer was managing partner at Zelos Group, and was a director and research fellow at Jupiter Research.