He has taught at Florida State University - Panama, Balboa Academy, and The International School of Panama. Robles' early work is heavily influenced by the music of the early 20th century, particularly by Edgard Varèse and Anton Webern. This is audible in his "Dos Piezas para Flauta Sola" (1996), "el cristo llora lágrimas de sangre" (1999) for voice and ensemble and "amanecer en tiempos de guerra" for orchestra (1999). In the latter, commissioned by the National Symphony of Panama and dedicated "to the Panamanian victims of invasion of December 1989", Robles presents angular motives which slowly develop melodically over quartal harmonies. Later works show clearer influences from Panamanian traditional music and poetry, and a turn to symmetrical harmonic constructions, although still in fourths and seconds. In "Coplas" (2010), Robles explores the tradition of improvised sung couplets (Four-verse strophes with rhyme scheme ABAB, or ABCB). Anonymous verses are juxtaposed with a piano accompaniment which recalls the 'torrentes' (harmonic and rhythmic patterns from the mejorana tradition of Panama). The use of Panamanian drumming patterns from 'tamborito' music are also a staple of Robles' work. "Zafra" (2009), for orchestra, is one instance of such use of traditional rhythms. The piece's tempo marking 'Atravesao' is frequently used by Robles, and refers to the 6/8 - 3/4 drumming pattern. The same rhythmic scheme and tempo marking is used in the second of the "Dos Miniaturas" (originally for flute and piano, also for violin and piano). The first movement, 'En Tiempo de Punto' recalls the colorful couple folk dance of the same name. There are a handful of tonal works in Robles' catalog, most of which are impressions of Panamanian music genres. His "Suite Panameña" (2009) is composed of three movements, depicting three styles of folk song and dance: Punto, Mejorana, Atravesao. Another example of this is "Lamento y Punto" (2009), which calls upon both the mejorana tradition, and the intimate couple dance form. "Works for Unaccompanied Instruments" A considerable portion of Robles' catalog consists of works for solo instruments; they are also his most widely performed.