Simeon Diamantidis was born in 1963 in Nea Michaniona of Thessaloniki. He is President and CEO of Diopas SA since 1982.

Diopas SA is a family business that manufactures nets for aquaculture, fishing, sports, as well as any special construction based on the net. It sells its products throughout Greece as well as in countries of Europe, Asia, and the Middle East. It is an environmentally friendly company and participates with various actions in the circular economy. Diopas SA is very active in research and development with the aim of zero environmental footprint.

• President of the Association of Professionals and Craftsmen of Nea Michaniona 2006-2010
• Vice-President of the Thessaloniki Chamber of Handicrafts 2008-2013
• Financial Supervisor of SEVE-Greek Exporters Association from 2018-2022
• Member of the Board of the Thessaloniki Chamber of Handicrafts
• Member of the Board of the Thessaloniki Chamber of Commerce & Industry
• Member of the Board of the Professional Chamber of Thessaloniki
• Member of the Administrative Committee of KEPA ANEM
• Member of the Board of Thess-Intec

From June 2022 he is President of SEVE-Greek Exporters Association.