Porter was most recently devoted to healthcare reform, Medicare and Medicaid, according to the announcement.
"Emily has the unique skill of understanding the complex world of healthcare policy and also the intricacies of the legislative process," Boehner said in a statement. "Our team is sad to see her go, but confident her next chapter will be a successful one."
The Nickles Group was founded in 2005 by former Senate Budget Committee Chairman Don Nickles (R-Okla.), who retired in 2004.
Porter will join the firm as a vice president on Feb. 25.