After graduating in 1976, Pilar taught courses in art history and
connoisseurship in both the undergraduate and graduate programs at the University of the Philippines College of Fine Arts from 1977, until his retirement in 2011. He served as a consultant and independent curator for various cultural institutions including the
Ayala Museum, the
Cultural Center of the Philippines, the
Metropolitan Museum of Manila, and the
Jorge B. Vargas Museum and Filipiniana Research Center. Pilar specialized in forgotten 19th and 20th-century Philippine artists including
José Honorato Lozano,
Justiniano Asunción,
Vicente Villaseñor,
Juan Arceo,
Domingo Celis and
Isabelo Tampinco that were published in the cultural magazine
Archipelago based on newly unearthed new data and led to the revaluation of the achievements of these painters. His essays on Philippine art were published in various local and international cultural publications including
Arts of Asia,
Orientations and
Zone-D. In 1980, Pilar published
Juan Luna: The Filipino as Painter, his monograph on the life and art of Philippine artist-patriot
Juan Luna considered as the main reference on the life of the artist. He subsequently served as a consultant for the
First National Juan Luna and Félix Resurrección Hidalgo Commemorative Exhibition at the
Metropolitan Museum of Manila, the largest exhibition of works by Luna and his contemporary,
Félix Resurrección Hidalgo held in the Philippines and wrote for the exhibition catalog in 1988. Another major contribution to Philippine art has been his research on the rediscovery of the 19th century Philippine sculptor
Isabelo Tampinco that began in an exhibition on Tampinco's works and that of his sons, Angel Tampinco and Vidal A. Tampinco in 1995 at the
Jorge B. Vargas Museum and Filipiniana Research Center. In 2014, Pilar published a detailed monograph on Tampinco and his works,
The Life and Art of Isabelo Tampinco that was concurrent with the loaning of several sculptures of Tampinco and his atelier from the private collection of Ernesto and Araceli Salas to the
National Museum of the Philippines. In 2017, Pilar published a revised version of the monograph called
Isabelo Tampinco with updated information on the artist. == Death ==