Question: Robert Walser and Ira Levin are both a?

Context paragraphs:
Robert Walser (writer): Robert Walser (15 April 1878 – 25 December 1956) was a German-speaking Swiss writer.

Burkhard Stangl: Burkhard Stangl (born 6 November 1960 in Eggenburg, Lower Austria) is a composer and musician, currently residing in Vienna, Austria.  Playing primarily guitar and electronics, he is a prolific performer in the world of electro-acoustic improvisation, having participated in over 50 recordings.  One of his most noted recordings is "schnee", a duet with Cristof Kurzmann, inspired by four films and a quote from writer Robert Walser.  It has been recorded live, as "schnee_live", and has spawned a similarly themed "meta-song suite," "neuschnee".  His 1997 opera "Der Venusmond" was recorded partially on the observation deck of the Empire State Building.

Schneewittchen (opera): Schneewittchen (Snow White) is an opera by Heinz Holliger.  He wrote the libretto based on a poetic text by Robert Walser in iambic trimeter.  The opera received its première on 17 October 1998 at the Zurich Opera House which had commissioned the work.  The work is a psychoanalytical reworking of the fairy tale, analysing the complex relationships between the roles.  It is not a .

Robert Walser (musicologist): Robert Walser is an American musicologist associated with the "new musicology".  He is author of the book "Running With the Devil: Power, Gender, and Madness in Heavy Metal Music", concerning heavy metal music.  Walser currently is a member of the faculty and director of the Center for Popular Music Studies at Case Western Reserve University.

Deathtrap (film): Deathtrap is a 1982 American thriller film based on Ira Levin's play of the same name, directed by Sidney Lumet from a screenplay by Levin and Jay Presson Allen, starring Michael Caine, Dyan Cannon and Christopher Reeve.  Critics gave the film mostly favorable reviews while noting its plot similarities to Caine's 1972 film "Sleuth".

Damion Searls: Damion Searls is an American writer and translator.  He grew up in New York and studied at Harvard University and the University of California, Berkeley.  He specializes in translating literary works from Western European languages such as German, Norwegian, French, and Dutch.  Among the authors he has translated are Marcel Proust, Rainer Maria Rilke, Robert Walser, Ingeborg Bachmann, Thomas Bernhard, Kurt Schwitters, Peter Handke, Jon Fosse, and Nescio.  He has received numerous grants and fellowships for his translations.

Carl Seelig: Carl Seelig (born May 11, 1894, Zurich; died February 15, 1962, Zurich) was a German-Swiss writer and patron.  He was best known as a friend, promoter and guardian of Robert Walser and the first biographer of Albert Einstein.

This Perfect Day: This Perfect Day is a science fiction novel by American writer Ira Levin, about a technocratic dystopia.  Levin won a Prometheus Award in 1992 for this novel.  "This Perfect Day" is one of two Levin novels yet to be adapted to film (the other being "Son of Rosemary", the sequel to "Rosemary's Baby").

Institute Benjamenta: Institute Benjamenta, or This Dream People Call Human Life, released in 1996, was the first feature-length film by the Brothers Quay, produced by Keith Griffiths and Janine Marmot.  It is based on "Jakob von Gunten", a novel written by Robert Walser.  It stars Mark Rylance, Alice Krige, and Gottfried John.

Ira Levin: Ira Marvin Levin (August 27, 1929 – November 12, 2007) was an American novelist, playwright, and songwriter.  His most noted works include the novels "A Kiss Before Dying" (1953), "Rosemary's Baby" (1967), "The Stepford Wives" (1972), and "The Boys from Brazil" (1976), as well as the play "Deathtrap" (1978).  Many of his novels and plays have been adapted to film.

Supporting paragraphs: Ira Levin Robert Walser (writer)
Answer: writer