Crain's exclusive Who's Who is an authoritative guide to power in Chicago with more than 400 names to know. Crain’s Sophie Rogers talks about this year’s list with host Amy Guth.Plus: City extends 60-day notices for migrants in city shelters amid dangerous weather; ad agency slashing office space, moving to Marshall Field building; JPMorgan Chase just made more annual profit than any U.S. bank ever; and developer gets $500 million in construction financing for project on Chicago Spire site.Crain's Daily Gist listeners can get 20% off a one-year Crain’s Chicago Business digital subscription by visiting chicagobusiness.com/gist and using code “GIST” at checkout.