Trying to trace a relative?

I am trying to locate a probably retired lawyer or possibly advocate named Annastassios Parthenion.He is/was from Athens.This man is my biological father,but I never knew him as I was adopted.He would have been practising law during the 1960's and 70's.Apparently he may have workeed for Stavros Niarchos.I... show more I am trying to locate a probably retired lawyer or possibly advocate named Annastassios Parthenion.He is/was from Athens.This man is my biological father,but I never knew him as I was adopted.He would have been practising law during the 1960's and 70's.Apparently he may have workeed for Stavros Niarchos.I am desperate to trace this man.I am 48 years of age and male.If anyone can help me I would be unimaginably grateful Thanks
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