Aaron Block, co-author with Zach Aarons of “PropTech 101: Turning Chaos into Cash Through Real Estate Innovation” (www.proptech101.com), is co-founder and managing director of MetaProp, a leading PropTech venture capital firm. Previously, he was chairman of Chicago-based BayRu, the U.S.-Russian-commerce company. Prior to that, he was an executive running the Chicago region of global commercial real estate services firm Cushman & Wakefield.