He is a Senior Researcher, and has been working at the CDRS since 2001. His research has focused on diseases monitoring since 2001, and in 2010 he began studying the population dynamics of Galapagos penguins, flightless cormorants, waved albatross and Galapagos flamingos, and their threats such as climate change, pathogens, non-infectious diseases, introduced species, and human interactions. He also handles the treatment of wild animals affected by human activities, and he is an advisor to the Galapagos National Park Directorate and the Galapagos Biosecurity Agency. In the last two decades, he was written over 50 scientific manuscripts as an author and co-author, and has given several presentations at local national and international meetings. His next project aims to understand the health of animals, humans, and ecosystems in an integrated and holistic manner.

In addition, Gustavo is a Member of the Association of Veterinarians of Pichincha Ecuador since 2002, a Member of the Working Group for the Agreement for the Conservation of Albatrosses and Petrels ACAP since 2012, a Member and Founder of the Wildlife Veterinarians Association of Ecuador since 2021, and a Member of the IUCN-SSC Flamingo Specialist Group.