According to Science Magazine’s Eli Kintisch, physicist John Holdren, from Harvard’s Kennedy School and director of the Woods Hole Research Center, will be nominated Science Advisor to the President by president-elect Barack Obama on Saturday.
Here’s some background from Science:

Holdren is well known for his work on energy, climate change, and nuclear proliferation. Trained in fluid dynamics and plasma physics, Holdren branched out into policy early in his career. He has led the Woods Hole Research Center for the past 3 years and served as president of the American Association for the Advancement of Science (which publishes ScienceInsider) in 2006.

We’ll have more as we learn more….