Donald Hornig, White House science adviser to former President Lyndon Johnson from 1964 to 1969, will speak at the University of Colorado at Boulder on Monday, Oct. 24, at 7 p.m. in the Old Main Chapel. The free, public event is part of a year-long lecture series titled "Policy, Politics and Science in the White House: Conversations with Presidential Science Advisers," sponsored by CU-Boulder's Center for Science and Technology Policy Research.