Born in Valencia, Carabobo state, on June 21, 1926. He studied at the School of Visual Arts and Applied Arts of Caracas, between 1941 and 1945. Expelled from the center to promote reforms, joins the group La Barraca de Maripérez, and works in ceramics. In 1948 he participated in the founding of the Free Art Workshop. A year later, he traveled to Paris and scholarship workshops here frequents André Lothe, Dewasne and Abstract Art Workshop, Edgar Pillet.
In 1950 in the formation of the group the following year Dissidents and ascribes to the avant-garde group platform Madi (short for dialectical materialism), who led the Argentine artist Carmelo Arden Quin. Guevara was the standard-bearers of geometric abstract art, exhibits with compatriots and foreigners in Gallery Suzanne Michel and annual salons Réalités Nouvelles. Study at the School of Fine Arts in Paris with Marcel Ducos Delahaille and Jaudon. Travel to Italy.
Thereafter, enters a building crisis and return to figurative art. Within a critical intentionality and ideological commitment, revalued figure with work experience and an instance expressionist abstractionist. Participates in international art biennials of Venice, in 1956 and 1958. Back in the country, is one of the most outstanding artists of the "New Figuration" opposite James Perez Borges and Regulus.
As has been emphasized teaching as a professor of drawing and engraving scenery. Major solo exhibitions: Ateneo de Valencia, Carabobo State, 1941 and 1979; Free Art Workshop, 1948, Sala Mendoza, 1961, 1963, 1966, 1969, 1973 and 1978, MBA, 1961 and 1967; Gallery Consulate of Venezuela new York, 1976, retrospective exhibition, GAN. Rewards: among many others, received the National Prize of Plastic Arts at the XXIX Official Venezuelan Art Salon, 1968.