The house that Newt built
After leaving Congress under a cloud in 1999, Newt Gingrich transformed himself into an entrepreneur, building an empire of companies and nonprofits that took in about $150 million over the past decade. The former House speaker disentangled himself from most of the firms to run for president. Since then, some of the organizations have changed in his absence. Read related article.
Public records, Gingrich representatives. The Washington Post.