Manuel Ballester has a doctorate in philosophy and has been a professor since 1985. He is the author of several books, including La unidad del pensamiento (1992), El camino del amor (1997), La filosofía de la matemática de Imre Lakatos (1998) and La búsqueda de sí mismo. Reflexiones sobre El Principito (1st ed., 2002). As well as writing he has edited Lecturas sobre la amistad (2004), Ante un mundo roto (2005), Lecturas sobre la libertad. Desde la literatura y la filosofÌa (2007) and Sobre la muerte (2009). He has also published numerous pieces in philosophy journals from Argentina, Chile, Spain, the U.S., France, Puerto Rico and Switzerland.