Alejandro Vallejo earned a BS in Molecular Biology and Biochemistry (1988) from Autónoma University in Madrid and a PhD in Immunology (1993) from Complutense University. He is now a Senior Researcher at the Health Research Institute of the Ramón y Cajal University Hospital in Madrid, Spain. His work in HIV-HTLV has resulted in more than 100 publications and presentations. His research interests include human retrovirus, immunology, and SARS-CoV-2.