Conversation so far:
what is secular humanism?
Secular humanism posits that human beings are capable of being ethical and moral without religion or belief in a deity
Did Julian Huxley come up with the theory of secular humanism?
As an organized movement, Humanism is quite recent, born at the University of Chicago in the 1920s, and made public in 1933 with the publication of the first Humanist Manifesto.
Did Julian Huxley write about the secular humanism theory?
Many of Julian Huxley's books address humanist themes.
Did Julian Huxley teach about secular humanism?
Both Julian Huxley and his grandfather gave Romanes Lectures on the possible connection between evolution and ethics
Where did Julian Huxley teach?
Julian Huxley was an Honorary Lecturer in the Zoology Department in King's College. From 1927 to 1931 he was also Fullerian Professor of Physiology at the Royal Institution.

Question: how many years was he a part of the Congress?
Self-contained rewrite: How many years was Julian Huxley a part of the Congress?