An Austrian Jew via Scotland - that's not something you hear about every day!
He also wrote books on Schubert and Brahms, and others on Wagner and Verdi.
Orchestral
===============================
Overture to a Puppet Play, Op.20, 1923
Symphony no.1 (Sinfonietta), Op.30, 1927
Ballet Suite (Scaramuccio), Op.36, 1929
Violin Conc., Op.39, 1932
Concertino, Op.43, piano, strings, 1934
Concertino, Op.52, violin, strings, 1939
Serenade, Op.46, strings, 1937
A Pickwickian Overture, Op.45, 1939–44
Lilliburlero: Improvisations on a Martial Melody, Op.48, c1943
Symphony no.2, Op.53, 1942–3
Concertino, Op.55, organ, strings, 1948
piano Conc., Op.57, 1948
Symphony no.3, Op.62, 1951–2
Cello Concerto, Op.67, 1944
Meanders, suite, Op.69, 1954–5
Idyllikon, Op.79, suite, 1958–9
Concertino, Op.87, cello, strings, 1966
Triptych, Op.100, 1970
Suite, Op.102a/b, viola/alto sax, orch, 1949
Symphony no.4 (Sinfonia concertante), Op.103, 1973
Chamber music
==============================
Variations on a Viennese ‘Heurigen’ Melody, Op.9, piano trio, 1914
5 Intermezzi, Op.10, str qt, 1914, also appeared as 4 Miniatures, Op.10a
Piano Quartet, Op.13, c1914
String Quartet no.1, Op.16, 1916
Piano Trio, Op.18, 1923
Divertimento, Op.22, 8 wind, 1924
Promenade Music for Wind Instruments (1926)
Quartet for violin, viola, cello and piano left hand (1926)
String Quartet no.2, Op.35, 1929
Serenade, Op.41, string trio, 1931
Lyrical Suite, for Soprano, Flute, String Quartet (1934) [Flute, Mandolin, String Trio arrangement]
Little Suite, Op.49a, 2 violin, cello, piano ad lib, 1947–8
Piano Trio, Op.49b, (1949)
Suite, Op.59b, 3 mandolins (1956)
Divertimento, Op.68c, 2 recorders, guitar (1958)
Quartettino, Op.78, 4 recorders (1960)
Concertino, Op.82, rec, string quartet/string orch/piano, 1961
Trio Serenade, Op.88, recorder/flute, violin, cello (1967)
Huyton Suite, Op.92, flute, 2 violins, 1940
Serenade, Op.93, clarinet, violin, cello, 1935
Trio, Op.94, oboe, violin, viola, 1941
String Quartet no.3, Op.95, 1969
Sonata, Op.96, 2 violins, piano, 1941
Trio, Op.97, clarinet, violin, piano, 1950
String Quartet no.4, Op.98, 1971
Suite, Op.6, cello, piano, 1919
Sonata, Op.17, violin, piano, 1920
Suite, Op.56, violin, piano, 1942
Sonatina, Op.59a, 2 mandolins (1952)
Improvisation, Theme and Finale on Mozart, Op.60b, String Qt (1934)
Suite, Op.68a, rec, violin, 1954–5
6 2-part Inventions, Op.68b, 2 recorders (1958)
3 Sonatinas, Op.71, violin, piano, 1956–7
Divertimento, Op.80, mandolin, harpsichord/piano (1961)
Sonata, Op.84, clarinet, piano (1965)
Sonata, Op.85, oboe, piano (1965)
Sonata, Op.89, cello, piano, 1953
Divertimento, Op.90/1, bassoon, cello, c1958
Two Scottish Rhapsodies, cello, piano (1960)
Divertimento, Op.90/2, violin, cello (1968)
Divertimento, Op.90/3, violin, viola, c1969
Sonata, Op.101, va, piano, 1941
Trio in f#, Op.104 for string trio
String Quintet, Op.106 (1976)
Sonata, Op.109, cello, piano (1982)
Clarinet Quintet, Op.107 (1977)
Piano: Serbische Weiser, op.3, 4 hands, 1916
3 Sketches, op.7, 1910–11
Suite for Clavier, Op.24 (1922)
Sonata, Op.28, 1927
Tunes from Old Vienna, 1934
3 Impromptus, for 2 pianos 1942
Sonatine Nr.1, Op.58 No.1 (1951)
Sonatine Nr.2, Op.58 No.2 (1951)
3 Preludes, Op.65 (1944)
24 Preludes, op.83, 1960
24 Fugues, Op.108 (1979)
Organ: Toccata, op.29, 1928
Prelude & Fugue in Ab (1956)
Phantasia, Arioso and Capriccioso
Several operas, songs, and large choral works - none of which I have heard.
I will have to sample the voice side of things on YT some day.
The New Grove: " Though an inheritor of the legacy of Brahms, he had by the time of his twenties found his own distinctive musical language to which, regardless of changing musical fashions, he remained true. It unites many elements: the clarity, playful humour and formal mastery of early Classicism; the chromatic harmony and extended tonality of early 20th-century, pre-serial music; a Schubertian love of melody; the lyricism and emotional restraint of Brahms and the contrapuntal textures that remained fundamental to his style. "