More than any other member of his (post-war) generation, Miguel Fisac was the epitome of the modern architect. His oeuvre spanned the second half of the twentieth century. With over 60 years in the profession and author of more than 450 designs, Fisac was one of the longestlived and prolific Spanish architects. But he never failed to mention the two battles he lost: town planning and social housing. Neither ever made it past the design stage: the first, embodied in the theories set out in his book La mol&#233;cula urbana (<i>The urban molecule</i>) and the second, in his patents for precast prestressed concrete systems that he was never able to implement.<br><br>La personalidad de Miguel Fisac aglutina mejor que la de ning&#250;n otro de su generaci&#243;n, en los a&#241;os de posguerra, la figura del arquitecto moderno por antonomasia. Su trabajo recorre toda la segunda mitad del siglo XX. Con m&#225;s de 60 a&#241;os de profesi&#243;n y m&#225;s de 450 proyectos, Fisac ha sido uno de los arquitectos m&#225;s longevos y m&#225;s prol&#237;ficos de nuestro pa&#237;s pero, aun as&#237;, siempre menciona sus dos grandes batallas perdidas: el urbanismo y la vivienda social. Ambas han quedado simplemente en un intento: la primera, desde sus teor&#237;as formuladas en su libro <i>La mol&#233;cula urbana</i>, y la segunda, desde sus patentes de sistemas prefabricados de hormig&#243;n pretensado que no ha conseguido llevar a cabo.