Ricardo R. Santos is a board-certified biologist and grief counselor. He is currently a researcher at the Institute of Environmental Health, Faculty of Medicine of the University of Lisbon, Portugal, where he is also the head of the science communication office, and a researcher at the Associate Laboratory TERRA, a Laboratory for Sustainable Land Use and Ecosystem Services. He is a consultant of the Academic Center of Study and Intervention on Grief and Bereavement at the Faculty of Medicine of the University of Lisbon, Portugal. He is also a member of the Human-Animal Studies Hub at the Institute of Social Sciences, University of Lisbon, Portugal. Editorial Board Review member of the Human-Animal Interaction Bulletin, an open-access, online publication supported by Division 17 (Counseling Psychology) of the American Psychological Association. His main interests are the study of human-dog interaction, bioethics, ethics of animal experimentation, and grief studies. On this last topic he has worked mainly on the disenfranchised grief and on the possibility of a natural history of grief.