Biologist, Master in biological sciences, graduated with honorable mention, nominated for the Alfonso Caso medal and currently candidate for doctor of sciences at UNAM.

Specialized in ecology, food webs, ecophysiology and evolution of flooded cave species. His current research is on the adaptive ecophysiology of
stygofauna of Yucatan cenotes.

He is also a SCUBA diving instructor with specialties in cave diving, advanced decompression techniques, extended range and trimix (among others). He has more than 15 years of experience in teaching recreational diving, 14 years of experience in technical diving and 9 years in scientific diving.

In addition, he is coordinator of scientific expeditions in reefs, caves, cenotes and deep environments. He has been funded for postgraduate studies by CONACYT, by the Croatian Herpetological Society (Croatia) and by the Department of Biology of the Faculty of Sciences of the University of Zagreb as a guest researcher, and by HARTE Charitable Foundation for a research stay in Texas A&M University.

Speaker at multiple national and international seminars, conferences and symposiums.

As a volunteer, Efraín constantly supports research activities of various groups, science dissemination projects and cenote conservation efforts in Yucatán.