Entrepreneurs are often said to be soothsayers and in 2002, David Ting founded Imprivata, a healthcare IT security company focused on keeping medical files private and locked online, allowing doctor’s offices and hospital physicians to more easily sign in to secure networks, whether text messaging platforms, electronic medical records, or prescribing databases. In June 2014, a decade later, Ting took his Lexington-based startup public, raising $66.3 million through its IPO. This July, Imprivata announced they were being taken private again, having been acquired by private equity firm Thoma Bravo in a deal valued at about $544 million.