Question: Where did the actor who played Simon Gruber receive his classical training?

Context articles: Paul Leyden
Edgar Barrier
Jeremy Irons
Regina Spektor
The Philadelphia Shakespeare Festival
Die Hard with a Vengeance
Dave Allen (actor)
Mohammad Aizaz Sohail
Ernesto Nazareth
Garrick Hagon

Paul Augustine Leyden (born 16 December 1972) is an Australian actor, producer and screenwriter.
 He is best known for playing the role of Simon Frasier on the daytime soap opera "As the World Turns".
 He played Simon in the 2009 mini series "Maneater".
 He also had a brief stint on "The Young and the Restless" as "Blake".
Edgar Barrier (March 4, 1907 – June 20, 1964) was an American actor who appeared on radio, stage, and screen.
 In the 1930s he was a member of Orson Welles' Mercury Theatre and was one of several actors who played Simon Templar on "The Saint" radio show.
 He also appeared in two films with Welles, "Macbeth" and "Journey into Fear".
 Barrier also appeared in the 1938 Welles-directed short, "Too Much Johnson", which was long believed lost but was rediscovered in 2013.
Jeremy John Irons (born 19 September 1948) is an English actor.
 After receiving classical training at the Bristol Old Vic Theatre School, Irons began his acting career on stage in 1969 and has since appeared in many West End theatre productions, including "The Winter's Tale", "Macbeth", "Much Ado About Nothing", "The Taming of the Shrew", "Godspell", "Richard II", and "Embers".
 In 1984, he made his Broadway debut in Tom Stoppard's "The Real Thing" and received a Tony Award for Best Actor.
Regina Ilyinichna Spektor ( , Russian: Реги́нa Ильи́нична Спе́ктор , ] ; born February 18, 1980) is a Russian-born American singer-songwriter and pianist.
 She was born in Moscow (former Soviet Union, now Russia), and began classical training on the piano at the age of six.
 When she was nine years old, her family emigrated from the Soviet Union to the United States, where she continued her classical training into her teenage years; she began to write original songs shortly thereafter.
The Philadelphia Shakespeare Festival is an annual Shakespearean theatre festival in Philadelphia.
 Every year, The Festival produces two or three productions of Shakespeare's plays.
 Starting out as the Red Heel Theatre in 1989, and changing name and purpose in 1993, The Philadelphia Shakespeare Festival is now the region’s only theatre devoted entirely to Shakespeare’s works.
 In 2008/9, they engaged in intensive planning with the board of directors and cultural and community leaders and decided to re-brand and rename the company to better reflect their programming.
 The Philadelphia Shakespeare Theatre now has several programs for adults and students including a lecture series featuring world-renowned Shakespeare scholars, Shakespeare School Tour which also tours in schools, and a Classical Acting Academy providing early career actors with intense classical training culminating in a free summer Shakespeare play for the public.
Die Hard with a Vengeance is a 1995 American action film and the third in the "Die Hard" film series.
 It was co-produced and directed by John McTiernan (who directed "Die Hard"), written by Jonathan Hensleigh, and stars Bruce Willis as New York City Police Department Lieutenant John McClane, Samuel L. Jackson as McClane's reluctant partner Zeus Carver, and Jeremy Irons as Simon Gruber.
 It was released on May 19, 1995, five years after "Die Hard 2", becoming the highest-grossing film at the worldwide box-office that year, but received mixed reviews.
 It was followed by "Live Free or Die Hard" and "A Good Day to Die Hard" in 2007 and 2013, respectively.
David (Gruber) Allen (born  1958 ) is an American television and film actor and comedian, who has been credited in many movies and television roles as Dave Gruber Allen and David Gruber Allen.
 Allen is known for his work on the 1990 TV series "Higgins Boys and Gruber" and playing guidance counselor Jeff Rosso on the Judd Apatow-produced comedy-drama "Freaks and Geeks".
 He also played Mr. Kwest on "Ned's Declassified School Survival Guide" and a town troubadour on "Gilmore Girls".
 Allen had a minor role as an "Electrocuted Ghost" known as "Sparky" in the 2016 film "Ghostbusters".
Mohammad Aizaz Sohail was born on May 22, 1987, in Karachi Pakistan and later moved to Lahore, Punjab.
 Mohammad Aizaz Sohail started singing at a very tender age of 6 years, he understood the intricacies of music at a small age under the guidance of his mother.
 At school level he used to lead the band choir and his college helped him unlock his full potential.
 When Tsunami struck Indonesia and almost every Pakistani was engrossed in collecting funds, Aizaz performed with the renowned Ghazal singer Tina Sani and received much praise and admiration.
 He won the ISEO (International Schools Education Olympiad) in the vocal category.
 Aizaz started taking formal Classical training from Master Abdul Rauf.
 Just after 6 months of training he was able to obtain a Gold medal in the All Pakistan Music Conference in the classical category.
 He also secured 2nd Position in the reality show Pakistan Superstar.
 Aizaz is the student of Ustad Faheem Mazhar.
 He is also taking help for vocal training from Anol Chatterjee who is the senior disciple of Pandit Ajoy Chakrabarty.
 He has worked in Pakistan Television Corporation and many other TV channels making successful appearances.
Ernesto Júlio de Nazareth (March 20, 1863 – February 5, 1934) was a Brazilian composer and pianist, especially noted for his creative Maxixe and Choro compositions.
 Influenced by African rhythms and many musical styles like the Lundu and the Choro, he never fully accepted this influence, refusing to give popular names to his compositions.
 A musician of classical training, he classified his music as "Brazilian tangos", since the Argentine tango and dances were considered fashionable at the time.
 His piano repertoire is now part of the teaching programs of both classical and popular styles, as Nazareth once served at the boundary between these two worlds.
Garrick Hagon (born 27 September 1939) is a British-born, Canadian film, stage, television and radio actor best known for his role as Biggs Darklighter in "Star Wars: A New Hope".
 His many films include "Batman", "Spy Game", "Me and Orson Welles" and "The Message".
 He was the rebel leader Ky in "Doctor Who: The Mutants" and played Simon Gerrard, Debbie Aldridge's husband in BBC’s "The Archers".