[1] Lou Briel started his career at a very young age as a singer, director and member of a pop musical group called Anexo 3.

Together they recorded four albums, the first two produced by Alfred D. Herger, and reached popularity with songs such as: "Oh, Cuanto te Amo" ("Oh, how much I love you"), "Contigo" (With you), & "Por eso estoy Preso", (That's why I'm a prisoner), among others.

Many international Latin singers have recorded Lou Briel's compositions, such as, Yolandita Monge, Gilberto Santa Rosa, Juan Manuel Lebrón, Zeny & Zory, Jose Feliciano, Tony Vega, Johanna Rosaly, Los Chicos, Pedro Brull, Sophy, Johnny Rivera, and Grupo Marfil (band) (from Costa Rica).

In 1991, he played the leading role as an actor-comedian in the TV sitcom called Cara o Cruz, (Heads or Tails), broadcast by WAPA-TV, opposite singer & actor, Edgardo Huertas, (whose first daughter Ambar, is Lou Briel's goddaughter).

From 1995 to 2001, Lou Briel produced and hosted his own variety show titled Voces en Función, (Voices in Performance) where he presented guest stars and young new talents.

It was the first time that 40 Latin pop and Christian gospel music celebrities joined for a laudable purpose, the eradication of child abuse.

This performance is produced by Entertainment Concepts Inc. As of 2008, Briel is featured, along Yoyo Boing, Shorty Castro, Dreuxilla Divine, Jose Miguel Class, and Francisco Rosa, at the La Receta de la Abuela Tour (Grandma's Recipe Tour), throughout the island of P.R., sponsored by MCS Classic Care, and produced & MC'd, by Luisito Vigoreaux.