Rubinstein, a 55-year-old Toronto native, was previously president and CEO of RubyRun Ventures, a media consulting and production company, and managing director of Keshet Canada, an international media producer and distributor.
He succeeds former president and CEO Max Gartner, who stepped down in July, and interim president Roger Jackson as the head of the national governing body for alpine, para-alpine and ski cross racing in Canada.
"I believe this is Canada's moment to show the world that we are the nation to beat," Rubinstein said in a statement Thursday.
"Our team at ACA, from the athletes and coaches to the staff and Board of Directors, is a highly motivated, talented and collaborative group and we're looking forward to working together to achieve great success on and off the hill."
Rubinstein officially starts his new role on Monday.