Argentine composer, pianist, arranger based in New York City. He is currently the leading exponent of nuevo tango, thanks to the skills and reputation he gathered while working extensively as Astor Piazzolla's regular pianist from 1978 until the maestro's retirement for health reasons in 1989. During their collaboration, they performed with Milva, Placido Domingo, Gary Burton among others. He played with Piazzolla's re-formed Conjunto 9 in 1983 for his Teatro Colon concert with the Buenos Aires Philharmonic. In 1985 Ziegler composed the music for the film Adios Roberto, and in 1990, he established the New Tango Quartet.