Together with Iñaki Ábalos, he founded the Ábalos&Herreros studio in 1984 and the International Multimedia League in 1992.
Since 2006, he has maintained a website through which he shares his professional, teaching, and research activities. Architect Herreros is a 2008 RIBA International Fellow of the Royal Institute of British Architects, recipient of the 2009 Fine Arts Medal from the City of San Lorenzo de El Escorial, winner of the 2009 AD Architecture Award, and was nominated for the 2010 medal from the American Academy of Arts and Letters.
Herreros Arquitectos currently has projects in Spain, Belgium, Panama, Mexico, and Norway, where the Munch Museum project in Oslo is nearing completion.