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Hongyu Liu joined Wisconsin Watch as a data investigative reporter in September 2025. He previously worked at The Post and Courier in Charleston, South Carolina, as a data reporting fellow. He conducts data analysis and creates interactive narratives and graphics to identify investigative stories and add context to reporting. Hongyu holds a master’s degree in data journalism from Columbia University. He previously covered local news for various publications in Boston and Beijing, including The Patriot Ledger, DIG Boston and Sampan Newspaper.
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Addie Costello is Wisconsin Watch’s digital/audio health reporter. She originally joined as WPR’s 2024-2025 Mike Simonson Memorial Investigative Reporting Fellow embedded in the Wisconsin Watch newsroom. Her reporting has been published by Marketplace, USA TODAY, the Austin American-Statesman, public radio stations across Texas and several publications in her home state of Nebraska. She holds a bachelor’s degree in journalism from the University of Texas at Austin.
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