The University of Pennsylvania's annual think tank rankings will be announced on January 22, 2015. The main launch events will take place in Washington, DC and New York, with a pre-launch event taking place in Philadelphia.
There will also be launches in more than 55 cities around the world.
The UPenn think tank report is considered the most comprehensive think tanks ranking
in the world, but it has many flaws and many detractors.
Here is a link to the 2013 report, which was released in early 2014, as well as a "cheat sheet" put together by Think Tank Watch.