Stephen Brown

Stephen Brown is not mentioned in either of the provided news articles. The first article discusses Donald Trump's nomination of Kevin Warsh as the next chair of the Federal Reserve. The second article focuses on the anniversary of the Quebec mosque attack and the renewed calls to end anti-Muslim hate. Therefore, it is impossible to provide any information about Stephen Brown based on the given context. The articles do not offer any details regarding his background, recent events related to him, or his current relevance.