Horn player for the Puerto Rico Symphony Orchestra since 2004, Horn Professor at the Puerto Rico Music Conservatory, College and Pre-College levels. Faculty at Clazz International Music Festival in Arcidosso, Italy, Brass Coach for the Puerto Rico Youth Symphony Orchestra and Substitute Horn Professor at the Juilliard Pre-College.

He is an active chamber music performer with Camerata Caribe, Café Corta'o Horn Quartet and Pantojazz. Joshua is also a songwriter and the author of the books "From Classical to Jazz an Improvisation Method", "Ornamenting your Improvisation a Guide to Approach Notes", “Chord Tone Arpeggios” and "Basics and Colors - Horn Etudes", the later one commissioned by the Juilliard's Music Advancement Program.

Pantoja has performed Masterclasses at Manhattan School of Music, The Mannes School of Music, The Juilliard Summer Program, Juilliard's Music Advancement Program, Bard College, Montclair University, Delaware University, Shenandoah Conservatory, Texas A&M Corpus Christi, University of Arizona. He was also a guest artist at the Southeast Horn Workshop (2023) at the University of Central Florida. Most recently Prof. Pantoja was on tour in Europe, performing Masterclasses in Germany, Switzerland and Italy, some of the schools and universities were: Frankfurter Bläserchule in Frankfurt, Hochschule für Musik in Hannover,  Hochschule für Musik in Nürnberg, Musik-Kurzwochen in Arosa. Another places Pantoja has performed Masterclasses are National University of Colombia in Bogota, University of Caldas in Manizales- Colombia, University of Eafit in Medellin- Colombia, Puerto Rico Music Conservatory and many different music schools in Puerto Rico; Faculty at the International Horn Festival and Academy in Manizales- Colombia, 2008 and 2009. During pandemic times he performed Online Masterclasses for the University of Panamá, Latino American Horns and Peruvian Horns.

Professor Pantoja began his musical studies at Escuela Libre de Música in Caguas, Puerto Rico at the age of 12, where he received his first French Horn lessons from Professor Jorge Figueroa. He obtained his Bachelor’s degree from The Juilliard School where he studied with Professor Jerome Ashby and his Master’s degree from Manhattan School of Music with Professor Javier Gándara. Currently he studies Jazz and Improvisation with Professor Julito Alvarado.

 Joshua performs with Puerto Rico Symphony Orchestra since 2004 as a member of the horn section. During the summer 2023, Prof. Pantoja was invited to performed Mahler Second Symphony  as part of the horn section of the NDR RadioPhilharmonie in Hannover, Germany. He also has performed with the The Orchestra of the Americas, where he visited countries in Central and South America, Europe and several states of the United States. In 2022 he was guest musician at the Puerto Rico Jazz Jam with the Humberto Ramirez´s Big Band. Other important musical ensembles that he has perform with includes Colombia National Symphony Orchestra, International Chamber Orchestra of Puerto Rico, Camerata Pops, Eafit Symphony Orchestra, Dominican Republic National Symphony Orchestra, American Russian Young Artist Orchestra (2002 Russia and USA Tour), New York Opera Society, Di Capo Opera in NY, Manhattan Virtuosi, Filarmónica Arturo Somoano in Puerto Rico, Caguas Municipal Band, Puerto Rico State Band,  Casals Festival Orchestra, The Juilliard Orchestra, The Juilliard Symphony, Manhattan School of Music Orpheus Institute, Manhattan School of Music Symphony, Philharmonic and Chamber Orchestras, Altenburg Music Festival (Germany), Idlyllwild Music Festival (California), The Orchestra of the Americas (2002-04 and 2006), Paquito D'Rivera 50th Anniversary All Stars Concert at Carnegie Hall, VII International Festival of Music and Sacred Art at the Vatican, Rome 2008, World Economic Forum 2010 at Carnegie Hall.     

Married to a beautiful Colombian woman, likes to spend his summers in Colombia. Loves coffee, birds and going to the beach.