Mateu Esteban recently joined Repsol YPF, Madrid, Spain, and was formerly a consulting geologist for Carbonates Int'l (Mallorca office), with 25 years of concentration in depositional facies, diagenesis and reservoir properties of Tertiary carbonates worldwide. Mateu worked previously for ERICO P.I. in London, Amoco Production in Tulsa, and at the University of Barcelona. He has been invited to become an AAPG Distinguished Lecturer for the third time. His studies on Miocene Carbonates of the Mediterranean and Almeria started in 1975.