Smartsheet CEO Mark Mader at the company’s ENGAGE customer conference in September 2023. (Smartsheet Photo) After leading Smartsheet for nearly two decades, Mark Mader is leaving the Bellevue, Wash.-based enterprise software giant. The company announced Tuesday that Mader is retiring as CEO and will leave the board at the end of September. Sunny Gupta, co-founder of Apptio and a longtime Seattle tech leader, will step in as executive chair and acting CEO. The leadership transition comes less tha...