On December 8, Columbia Journalism Review (CJR) selected the 2015 recipients for their annual list of best and worst journalism of the year.

“It’s been a standout year for journalism,” wrote David Uberti and recognized The Seattle Times’ and Center for Public Integrity’s joint investigation series that helps protect vulnerable mobile-home buyers. The series explored the mobile-home industry’s biggest manufacturer and lender, part of Berkshire Hathaway, led by fabled investor Warren Buffett. According to CJR:

Buffett was forced to defend the firm from charges of predatory sales and lending practices at a shareholders’ meeting in May, later conceding that its customers’ default rate could be much higher than previously reported. The Times-CPI project was referenced as Congress debated new regulations for the mobile home industry—a refreshing reminder that a local newspaper, backed with nonprofit firepower, can still drive national discussion.

Read the series: The mobile-home trap: How a Warren Buffett empire preys on the poor