When Karen Feldman launched her Czech glass company, Artěl, she was a newly arrived American ex-pat living in Prague, had no contacts in the Czech Republic’s age-old glass-blowing tradition, and didn’t even have a phone. (“I had a voice mailbox, which I called to see if a fax had arrived at the main post office, where I picked it up and sent a response,” she says.) Since these pioneer-spirited beginnings, Feldman has built a veritable glass emporium, whose wares are not only beloved abroad—Paul ...