Andrea Chermayeff wishes she’d kept a diary during the fall of 2013. That was the time when Chermayeff, a Harvard Business School graduate who’d left the workforce for 15 years to stay home with her four children, was a member of the inaugural class of J.P. Morgan’s ReEntry program, one of a growing number of return-to-work programs offered by Wall Street firms and other professional employers. “I wish I’d documented how petrified I was,” she recalls. “I felt that I wouldn’t match up, somebody would figure it out, and it would be – game over.”