Ten years before Theodor Herzl attended the Dreyfus Trial, a Jewish law student from Vienna coined the term Zionism, and effectively founded the movement that Herzl later took over. But the titanic figure of Dr Nathan Birnbaum has been forgotten, because he abandoned Zionism, and underwent an odyssey that comprised Yiddish nationalism and ultimately led him to Agudas Yisroel. 90 years on, it’s clear that Nathan Birnbaum wasn’t the erratic personality that some detractors saw, but a visionary whose leadership should be remembered today.