No. 10 DANIEL ROTHENBERG, 32
UBS Los Angeles
Production: $4.08m
AUM $2.13b

The choppy markets of 2008 and 2009 taught UBS financial advisor Daniel Rothenberg an important lesson about client service: It's the only part of the business he can control. "Clients didn't expect us to know the market was going to go down 40%, but they did expect that we would work hard to help them solve a problem," Rothenberg says.

To that end, it was not unusual to find him in the office from 5:30 a.m. until late at night. He formed an advisory council of clients to explore how his practice could improve. Even now, with markets on a steadier course, "managing the service side of the business is more important to us than getting the exact right investment," he says.

Performance is still important, but Rothenberg has the benefit of clients who are generally oriented toward long-term outcomes. Based in Los Angeles, the 32-year-old advisor's AUM is primarily institutional retirement plans. "It's hard to ignore the headlines, but we're more focused on what will happen 10 or 15 years from now," he says. With his partner, Roger Stephens, he serves about 60 institutions and 60 individuals.

These days, a happier disruption is teaching Rothenberg new lessons—a two-year-old daughter at home and another child on the way. Becoming a father "has changed the way I view business," he says, and even affected how he schedules time. Now, he confesses, his workday might start at 6 a.m. instead of 5:30 am.