Schmidt-Isserstedt was born in Berlin on 5 May 1900.[1] He studied composition with Franz Schreker at the Berlin Hochschule für Musik, and was also a student at the universities of Heidelberg and Münster and Berlin.[2] At the last of these he wrote a doctoral dissertation on the Italian influences on the instrumentation of Mozart's early operas.[1] Early music influences on him included the conductors Arthur Nikisch and Felix Weingartner.[3]
In 1923, Schmidt-Isserstedt joined the Wuppertal Opera as a répétiteur. He held conducting positions at the Stadttheater Rostock (1928–1931), conducting the municipal orchestra, and of the Staatstheater Darmstadt (1931–1933). In 1935 he was appointed of first conductor at the Hamburg State Opera, a post he held until 1943. In that year moved to the Deutsche Oper Berlin as director of opera, and became Generalmusikdirektor there the following year.[2] He managed to hold these senior posts – and to be put on the Gottbegnadeten list of the Third Reich's élite artists – despite avoiding joining the Nazi Party,[4] and having a Jewish wife, whom he sent to England for safety, with their two sons, in 1936.[5]
In 1945, after the end of the Second World War, the occupying British forces set up a new radio station, the Nordwestdeutscher Rundfunk, based in Hamburg. The director-general, Hugh Greene, appointed Schmidt-Isserstedt as director of music, and tasked him with assembling and training a symphony orchestra for the station. The conductor's biographer Hubert Rübsaat writes that he formed an orchestra "out of nowhere" ("aus dem Nichts").[6] He took as his models the BBC Symphony Orchestra in London and the NBC Symphony Orchestra in New York – orchestras formed primarily for broadcasting, with the highest standards of playing.[7] It took him six months to bring the new Northwest German Radio Symphony Orchestra (NWDR SO) to the standard he required, and in November 1945 he conducted its first public concert. In a survey of radio orchestras in 1955, The Musical Times commented that the NWDR SO had quickly been recognised as "fit to challenge even the Berlin Philharmonic".[3]
For the next 26 years, Schmidt-Isserstedt remained musical director of the NWDR SO. He invited many guest conductors to work with the orchestra, but its regular studio broadcasts were mostly under his direction. He introduced a public concert season, giving ten programmes a year.[3] The repertoire was wide, including works by composers whose music had been banned by the Nazis, such as Bartók, Stravinsky and Hindemith and recent works by Tippett, Britten and other contemporary composers.[3] Schmidt-Isserstedt and the orchestra toured abroad, playing in France, Britain, the USSR and the US.[1] From 1955 to 1964, he combined his duties at Hamburg with those of principal conductor of the Royal Stockholm Philharmonic Orchestra,[7] and he appeared as a guest conductor with more than 120 orchestras in the principal musical centres around the world.[1]
Schmidt-Isserstedt returned to opera from time to time. His first post-war opera production was Purcell's Dido and Aeneas at the Hamburg State Opera, and in the late 1940s he gave the first German performances of Britten's version of The Beggar's Opera.[8] For Glyndebourne Festival Opera, both at its base in Sussex and at the Edinburgh Festival, he conducted Così fan tutte, Le Comte Ory, Ariadne auf Naxos and The Soldier's Tale,[9] and a celebrated series of performances of The Marriage of Figaro (1958), with a cast he considered near ideal, including Geraint Evans, Pilar Lorengar, Graziella Sciutti and Teresa Berganza.[7] At the Royal Opera House, Covent Garden, he conducted Tristan und Isolde with Wolfgang Windgassen and Birgit Nilsson in the title roles (1962) and Der fliegende Holländer with Donald McIntyre as the Dutchman (1972).[10]
Among Schmidt-Isserstedt's own compositions were songs, the opera Hassan gewinnt (Rostock, 1928), and works for orchestra.[1]
Schmidt-Isserstedt died in Holm, Pinneberg, near Hamburg, on 28 May 1973, aged 73.[1] The Times summed up his achievements:
Schmidt-Isserstedt aimed at a transparent orchestral texture and strict rhythmic precision, rejecting all superfluous gestures and mannerisms. After World War II he became an advocate of Bartók, Stravinsky and Hindemith, whose music had long been outlawed in Germany. But his chief love was Mozart, whose works he conducted in a remarkably relaxed and delicate way. This is shown particularly by his recordings of
Idomeneo and
La finta giardiniera.
[7]