Sebastián is a globally famous artist who is considered the foremost living sculptor in Mexico. His smaller scale work includes jewelry, sacristies, garden sculptures, and painting. However, he is most known for his monumental structures constructed in iron or concrete, which decorate cities throughout the world, from San Antonio, Texas to Osaka, Japan. He is considering a sculpture for Singapore, perhaps for University Town itself!
When studying in Mexico City, he survived by working at restaurants and buying clothing to sell for a profit. He studied in the Escuela Nacional de Artes Plásticas (National School of Plastic Arts) at the Universidad Nacional Autónoma de México (UNAM). Persisting with deep appreciation for Henry Moore and Pablo Picasso, he won first award in the 1965 Annual Exposition of the National Plastic Arts School at UNAM.
In 2007 Sebastián designed and built the sculpute "La Gran Puerta de México" (The Gateway to Mexico) in the northeast city of Matamoros.