Ernesto Acher (born in Buenos Aires on October 9, 1939) is an Argentine comedian, actor, composer, arranger, multi-instrumentalist and orchestral conductor.

Between 1971 and 1986 he was a member of the celebrated Argentine group Les Luthiers, with which he acted as composer, comedian, singer, and performer on more than twenty instruments, some of which he created himself.

Some of his works are: a cycle of jazz pieces with single-vowel titles (a joint idea with Carlos Núñez Cortés), Miss Lilly Higgins, Bob Gordon, Papa Garland, Pepper Clemens and Truthful Lulu; his folk pieces La yegua mía, Añoralgias and Epopeya de los quince jinetes; Teresa y el Oso (Theresa and the Bear), a symphonic poem for narrator and the informal-instruments ensemble, parodying Prokofiev´s Peter and the Wolf, and transcribed in 1976 for narrator, informal instruments and symphonic orchestra; Quartet Op.

He also collaborated with Núñez Cortés in the “glamocot” (which can be heard inTheresa and the Bear) and the “clamaneus”, which has never been introduced, and with Carlos Iraldi in designing Antenor, the musical robot in the 1979 show Muchas gracias de nada (Much ado with nothing at all).

Besides his activity with Les Luthiers, he composed the soundtrack for Carlos Jerusalinsky´s medium-length film Caja de sorpresas (Jack-in-the-box), based on a short story by Ray Bradbury, which received several awards at the 1976 Uncipar Festival, and had his String Sextet performed at the 1978 Contemporary Music Festival at Santiago, Chile, as well as Molloy, a symphonic poem for viola and orchestra, with soloist Marcela Magín and the Buenos Aires Philharmonic under maestro Pedro I. Calderón, in 1980.

Acher´s diplomatic explanation is that “Les Luthiers is a multiple marriage, and gentlemen do not ask spouses what went on in their marriage.”[1][3] In early 1988 Acher brought together some of the best Argentine jazz musicians in La Banda Elástica (The Elastic Band).

Also that year he performed the first version of his Veladas espeluznantes (Creepy soirées), combining repertoire works with musical jokes, conducting the Rosario Symphony Orchestra, Argentina, with the participation his friends Daniel Schapiro and Carlos Núñez Cortés for the occasion.

It ended abruptly in July 2000 with López Furst´s death, which precluded an eventual performance in Los Angeles (USA) with the American Jazz Philharmonic.

In 2005, after a short interval, the show made a dashing comeback to the Colon Theatre with more than twenty sold-out performances, and was repeated in Córdoba and Bahía Blanca (Argentina), Asunción (Paraguay) and still is going on.

A revised version of the Gershwin project was presented with Jorge Navarro trio and orchestra during the 2006 Easter at the Wine Festival in Mendoza, Argentina.

Since 2006 Acher has been professor of subjects related to art and literature at the Diego Portales University in Santiago, Chile, whilst continuing with his musical and humour activity.

After a short period as Artistic Director of the Linares Town Hall in 2013, he was appointed as Resident Conductor of the 'Orquesta Clásica del Maule', post which he held until December 2014.