Conversation so far:
What was Julian's Huxley's secular humanism?
Huxley's humanism came from his appreciation that mankind was in charge of its own destiny, and this raised the need for a sense of direction and a system of ethics.
What else did Sir Julian Huxley do besides secular humanism?
Sir Julian Sorell Huxley FRS was a British evolutionary biologist, eugenicist, and internationalist.
Are there any other interesting things about Julian Huxley besides being a British evolutionary biologist, eugenicist, and internationalist?
Julian Huxley presided over the founding Congress of the International Humanist and Ethical Union.

Question: Served with what
Self-contained rewrite: Who did Julian Huxley serve with in the Congress of the International Humanist and Ethical Union?