Fernando Caudevilla, part of the ICEERS team, is a specialist in family and community medicine with a long career in harm reduction and public health. For more than two decades he collaborated with Energy Control, one of Europe’s pioneering substance-checking and drug information services. Also known as Doctor X, he has carried out extensive outreach and counseling work, including answering health questions on the Silk Road forum. This page gathers articles, publications and contributions associated with him on the ICEERS website.