He is a multidisciplinary artist with a 20-year career spanning roles as an actor, theater director, producer, casting director, filmmaker, screenwriter, and playwright. He is also the founder of the Theatrón group.

He began his acting training under the tutelage of actor and director Sebastián Falco at the Teatro San Martín, later perfecting his craft with mentors such as Anibal Grum and Roberto Moll. A key element in his development was the opportunity to study with renowned American actor Paul Calderón, a figure who has collaborated several times with Quentin Tarantino, Martin Scorsese, and Tom Cruise, and who is also a professor at the prestigious Lee Strasberg Theatre and Film Institute. Alejandro's passion for learning led him to study at the Comprehensive Center for Artistic and Actoral Training (CICA), where he absorbed knowledge from figures such as Mario Sudano, Karl Hoffmann, and Manuel Salazar. His versatility led him to explore musical theater with Andrea Sousa, a graduate of the Stella Adler Studio of Acting, and to immerse himself for three years in the rigorous training at the Actors' Gymnasium with Matilda Corral, a graduate of the Actors Studio Drama School. He complemented this foundation with a Meisner technique workshop taught by Noel Cisneros, and a workshop with the DeusExMachina group, under the guidance of Rossana Hernández, Elvis Chaveinte, and Gabriel Aguero.

In the world of theater directing, Alejandro Bello initially trained as an assistant director, working with and absorbing the expertise of renowned Venezuelan stage directors. At the same time, he enriched his vision with classes from prominent figures such as Samuel Medina of the Círculo de Actors in Caracas; Lupe Gerenbeck, a member of the directors' unit at the Actor's Studio; Diana Volpe, a graduate of the prestigious HB Studio in New York; and with maestro Javier Vidal, under the auspices of the Isaac Chocron Foundation, in addition to a workshop with director Alexander Malinowski.