• Hellenic Mathematical Society
  • American Mathematical Society
  • California Alumni Association
  • American Association for the Advancement of Science
  • Sigma Xi , The Scientific Research Society
  • The New York Academy of Sciences
  • Academy of Arts and Sciences of the Americas
  • International Academy of Creative Endeavors (IACE), Russia
  • Royal Astronomical Society, London, UK
  • The Marquis Who’s Who Publ. Board in Sciences and Engineering
  • International Society of Difference Equations (ISDE)
  • Research Group in Mathematical Inequalities and Applications (RGMIA) , Victoria University , Australia

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