In 1893 he began work at the Walter Rothschild's Museum at Tring, specialising in Coleoptera, Lepidoptera and Siphonaptera.
Lionel Walter Rothschild, 2nd Baron Rothschild (1868–1937), the eldest son of Nathan Rothschild, 1st Baron Rothschild
Nyceryx continua cratera Rothschild & Jordan, 1916 (Peru, Bolivia, Argentina and Brazil)
Walter Scott | Sir Walter Scott | Rothschild family | Baron | Walter Cronkite | Walter Raleigh | Walter Benjamin | William Cecil, 1st Baron Burghley | Walter Mondale | Rothschild | Walter Matthau | Walter Gropius | baron | Walter Hamma | Charles Lennox, 2nd Duke of Richmond | Sacha Baron Cohen | Joseph Lister, 1st Baron Lister | Joey Baron | Robert Baden-Powell, 1st Baron Baden-Powell | Henry Brougham, 1st Baron Brougham and Vaux | Walter Savage Landor | Walter Burley Griffin | Robert Devereux, 2nd Earl of Essex | Hugh Grosvenor, 2nd Duke of Westminster | Guy Carleton, 1st Baron Dorchester | Edward Harley, 2nd Earl of Oxford and Earl Mortimer | 2nd United States Congress | Walter Payton | Walter | Bruno Walter |
His collections were acquired by the Natural History Museum in part directly and also through the collections of Allan Octavian Hume, Lord Rothschild and others.
allotei was described by Rothschild in 1914 as a species, despite the assertion by its discoverer, Abbé Allotte, a priest at the Buin Mission, Bougainville Island, that it was a natural hybrid.
The species was named by Walter Rothschild in 1907, in honour of Alexandra of Denmark.
In 1917, the British Foreign Secretary Arthur James Balfour communicated the Balfour Declaration to the leader of United Kingdom's Jewish community Lord Rothschild for transmission to the Zionist Federation.