Professor Green's research interests include the long 19th century, especially nationalism and regionalism in 19th century Germany; Jewish internationalism and comparative religious internationalisms; humanitarian philanthropy and the pre-history of human rights; and liberalism.
- International Jewish history, modern Jewish history
- History of human rights, including humanitarian intervention, especially in the 19th century
- Religious internationalism (comparative)
- 19th century Germany, German nationalism
- History of philanthropy
Dr Green has media experience.