A Maranaw royalty, Concepcion was born in Marawi City, in the Island of Mindanao, Philippines. At 17, he left for the U.S. and studied at the San Francisco State University where he majored in Painting and Theater Design.
After graduation he joined the Warwick Theaters in New England as Set Designer. Concepcion later moved to Montreal, Canada to further his studies at the Ecole des Beaux Arts while at the same time serving as Art Director for Morgan’s Department Store and designing sets for Trinity Theater.
Fascinated by ancient history, Tomas travelled to Europe to tour museums. He was eventually lured to Italy where he attended l'Accademia di Belle Arti in Rome. He has remained in Italy ever since as he got enamored with the monuments, sculptures and art. 
He debuted at the Palm Beach Galleries in 1963.With more than 50 years of tenure in the art world, Concepcion is known for his eloquent bronzes and paintings in the U.S. as well as in Europe. He has exhibited in Rome, Paris, London, San Francisco, Los Angeles and Manila. His works are included in the private collections of top dignitaries all over the world. Monuments that bear his notable sculptures are of Pope John Paul II displayed in Guam, Pope Paul VI in the Vatican, Walking Christ in Israel, Padre Bayl in Texas and Father Junipero Serra in Los Angeles.  In Manila, his statue of Ninoy Aquino is at the People's Park on EDSA.

April 2007, his return to the Manila visual art scene found him paying tribute to the greatest painter and sculptor from the 15th Century Renaissance to today, "Michelangelo as the first modernist to free art from the stiff and strict stereotype." Homage to Michelangelo was mounted at Galleria Duemila in Pasay City, Philippines.  
Homage to Michelangelo was the first time for the Italian Embassy to support a Filipino art exhibit. In his keynote speech Ambassador Rubens Anna Fedele said, "Homage to Michelangelo is a representation of the beautiful relationship of the Italians and the Filipinos."

A long-time Rome resident, Concepcion weds social problems and anti-violence in art. He prefers his sculptures to have life, full of motion, "I'd like for them not be nailed to the floor." He conveys his beliefs in his work, he says, "If it can do something, have some tangible effect, that is its purpose."

His presence is hard to miss. In a room full of people, his laughter resonates. When he speaks.. mesmerizing. His wealth of experience and knowledge in art, Christian Democracy or simply life in general… captivating. He is after all vivendo una vita bellissima, piena di passioni e colori. (Mabel Guia Acosta)