A thanasios Martinos is a prominent member of one of Greece's most powerful and respected shipping dynasties. He and his two brothers, Andreas and Constantinos, inherited the shipping company Thenamaris from their mother. In the 1990s, the three brothers decided to go their separate ways, splitting the family assets and each founding their own independent shipping companies.

Athanasios founded and runs Eastern Mediterranean Maritime (Eastmed), which operates a large and modern fleet primarily focused on tankers and bulk carriers. While his brothers have also built massive shipping empires, Athanasios has also diversified his interests into real estate and is a noted philanthropist and art collector. He is deeply involved in supporting the Greek Orthodox Church and has funded numerous cultural and social projects throughout Greece. His career is a testament to the enduring power and influence of Greek families in the global shipping industry.