A father-son duo takes Ohio’s Marlen Jewelers into its centennial—and beyondFrank Eilberg, owner of Marlen Jewelers in the Cleveland suburb of Rocky River, Ohio, always knew his son, Andrew, had a good head for business. “He’s just an incredible numbers guy,” says the third-generation retailer. But after Andrew enrolled in the prestigious Kelley School of Business at Indiana University, Frank assumed his company would never be big enough to appeal to his son, who had dreams of working on Wall Street. Andrew did nab a job in finance—at Standard & Poor’s—after graduation, but discovered almost immediately that the high-stakes, pressure-cooker Wall Street world wasn’t for him. “I absolutely hated it,” the 27-year-old recalls. “I called my dad and said, ‘What would you think about me coming home?’?” Frank’s reaction: “You could have knocked me over with