Merlin`s biography is published in the Who's Who in Music (London) alongside the world's most distinguished musicians. He was born in Buenos Aires, Argentina in 1952 and began playing the guitar at the age of 5, under the tutelage of maestro "Vincente Degese". He continued with maestro "Abel Carlenaro" and was performing numerous concerts in Argentina by the time he was 9 years old. He has been a concert artist, composer, and guitar teacher since 1967, as well as a researcher and teacher of instrumental technique.

Since 1984, Merlin has been touring Brazil, Canada, Europe and the United States. He has made more than twenty international tours which included Spain, Austria, USA (over 100 concerts), Canada, Cuba, Germany, France, Switzerland, Italy, Brazil and Uruguay. He has given concerts in such renowned halls as the Centro Cultural de la Villa (Madrid, Spain), the United Nations (New York, USA), the Museums of Art in Dallas and Detroit (USA), the Teatro Juan Bravo (Segovia, Spain), the Teatro Nacional Cervantes (Buenos Aires), as well as on public radio and television in Ohio, Michigan, Oregon, California, Texas (USA), and on the international channel of Deutsche Welle (Germany). He has been invited on five occasions to give classes and lectures at universities in the US and Germany.
Merlin has played as a soloist with the Symphonies of Rosario and San Juan (Argentina), and has performed chamber music with the following quartets: Buenos Aires, Sudamérica, Sudamericano, Musicámera, del Plata, and the Grupo Merlin. He is co-founder and first president of the Association Integración Guitarrística Argentina. He is the founder and Director of the Centro de Estudios Musicales (a school of music for all levels). In addition, he has published more than ten recordings in Japan, Austria and Argentina.

In his role as a composer he has given workshops on instrumental techniques, rhythmic folklore of Argentina, insights & analyses of South American composers, as well as lectures at universities in Texas, Southern California, Oregon & Michigan. He composed the Music for Travesia (The Guitar, Witness to Five Centuries), an oratorio for recitative, singing voice, mezzo-soprano and chamber orchestra. Merlin has also composed works for solo guitar, guitar and violincello, guitar and string quartet, piano and voice, etc. His works have been published by Tuscany Publications and Shamrock (Austria) (distributed by Theodore Presser, New York). His publications have received critical acclaim in the music press. He has arranged and adapted works by Beethoven, Scarlatti, Bach and Piazzola.
More accomplishments defining Merlin's extraordinary career include his founding the Centro de Estudios Musicales Merlin for the teaching of guitar, piano, singing, choral singing, flute, saxophone, harmony, composition, and percussion. He is currently the Director of the Music Department and a Guitar Professor of the Mundo-Velázquez School of Music in Madrid.