Margaret Whelan CEO, Board Director, Whelan Advisory, TopBuild Margaret Whelan, CEO of Whelan Advisory and board director of TopBuild (NYSE: BLD), began her career as a sell-side analyst covering home builders and building products companies and was a top ranked Institutional Investor All-America stock analyst before moving to investment banking as the senior coverage partner for residential real estate companies. In 2014, she started an advisory business to provide strategic and financial counsel to leaders of both public and private companies globally.