Initially trained at Universidad Central de Venezuela, then completed his MSc in Infectious and Health in the Tropics at the London School of Hygiene and Tropical Medicine (Distinction) and obtained the Diploma in Tropical Medicine and Hygiene from the Royal College of Physicians. He gained his PhD from University College London (UCL) in 2006 on HIV and AIDS. Since 2004, Alejandro has been working at the UCL Centre for Clinical Research in Infection and Sexual Health, which is attached to one of the largest HIV clinics in the UK. Alejandro joined the Medical Research Council (MRC) Clinical Trials Unit at UCL as Senior Clinical Scientist in 2008 and has been working on national and international clinical trials on treatment of HIV disease ever since.