Nikolaos G. Kladis, 80, of Billerica, Massachusetts passed away on February 2, 2023 surrounded by his loving family. Beloved husband of Ekaterini (Vourliotis) Kladis. Devoted father of Maria Kladis and her fiance Ricardo Sanchez. Loving Pappou of Dimitrios Kladis.  Brother of Spiros Kladis and his wife Panagiota, and Stavros Kladis.  Also survived by many relatives and friends here and in Greece.  Funeral Service on Wednesday, February 8, 2023 10:30AM at Hellenic College of Holy Cross, Holy Cross Seminary Chapel, 50 Goddard Avenue, Brookline, MA.  Visitation prior to the Service from 9:30AM to 10:30AM. Relatives and friends are kindly invited to attend. In lieu of flowers, donations in his memory may be made to the Hellenic College and Holy Cross Greek Orthodox School of Theology, 50 Goddard Avenue, Brookline, Massachusetts 02445.  Burial in Fox Hill Cemetery, Billerica, Massachusetts.