Daniel (Danny) Seidemann has lived in Jerusalem since 1973. He has been a member of the Israeli Bar Association since 1987. Since 1991, he has specialized in the geopolitics of contemporary Jerusalem, and the Israeli-Palestinian conflict in the city.
Danny and his colleagues founded, Terrestrial Jerusalem, and are frequently consulted by senior decision-makers and governmental bodies on matters pertaining to both unfolding developments in Jerusalem and the broader issues relating to a permanent status agreement. He has also been conducting ongoing discussions on Jerusalem issues within the Arab world, and with Christian faith communities and diaspora Jewish communities. He has participated in numerous Jerusalem-related projects, colloquia and track-two deliberations.

In 2010, Queen Elizabeth II awarded him the title of honorary Member of the Order of the British Empire in recognition of his work in Jerusalem.