Constantine Sideridis is a member of the St. George Greek Orthodox Church, in Lynn, MA, and was invested as Archon in 2015 and conferred with the offikion Protonotarios.

A founding member of The Ecumenical Patriarch Bartholomew Foundation, Archon regional commander for the Metropolis of Boston, co-chair of the Archon International Committee, and part of the FAITH Endowment’s Executive Education Program in Strategic Leadership and Transformative Action (SLTA), a fulfilled member of Leadership 100, a member of the Archdiocesan council of the Greek Orthodox Archdiocese of New York, and a council member of the Metropolis of Boston, and member of the Fellowship of Orthodox Stewards (F.O.S) in Brookline, MA.

Archon Sideridis has served as chairman of the Metropolis camp golf tournament (2016-2023) and continues to support the Boston Metropolis summer camp by heading fund raising activities. In addition, he is parish council Vice President board member, former Stewardship chairman, and committee member of the endowment and legacy giving at the St. George parish in Lynn, MA.

Archon Sideridis is a trained engineer, who owns a private Massachusetts firm specializing in the manufacture of advanced ceramic materials supplying the semiconductor, medical, aerospace, defense, electronic, and microwave industries in the US and throughout the world. Founded in 1966, the company continues to be a leading entity in the field of technical ceramics. He serves as a trustee and advisor for a variety of academic, commercial and philanthropic organizations in the US and abroad.

Archon Sideridis has played a significant role in the promotion of Hellenism in the Boston area by serving as the president of the Alpha Omega Council from 2020-2022 while leading several committees as chairperson since 2014. He is also Boston regional co-chair for the National Hellenic Society (NHS) 2014 to present, and a member of the Order of AHEPA, Aristidis Chapter #50, Lynn MA.