Registration is now open for our second Quantitative and Systems Pharmacology Workshop, which will be held September 9-10 on the NIH campus in Bethesda, MD. The meeting is intended primarily for pharmacologists, pharmacokinetic/pharmacodynamic modelers, systems biologists and others working in fields relevant to this emerging discipline. I first announced plans for the workshop on the Feedback Loop, and your comments both to the post and to the organizing committee helped us develop the agenda. This year’s scientific talks, researcher perspectives, panel discussions and poster presentations will focus on key questions related to the integration of pharmacology and systems biology and how it can aid our understanding of drug actions and drug discovery. Specific questions range from how we articulate a vision for systems pharmacology to what needs to happen to achieve that vision. The meeting’s co-chairs, Peter Sorger of Harvard Medical School and Sandra Allerheiligen of Merck, Inc., along with the organizing committee have put together an exciting group of confirmed speakers who represent academia, industry and the many disciplines relevant to systems pharmacology. Please note that we are still adding specific talk titles and soliciting poster presentations. Registration is free, but slots are limited—don’t postpone registering if you want to attend!