When interior designers think about expanding their brands, it's not uncommon for them to venture into furniture design, say, textiles, or home accessories. Less common is the foray into the vast universe of tiny Hans Wegner tables, minuscule Thonet chairs, or small, circa-1970 Eero Aarnio lounges, all made for kids. But that's exactly what Bachman Brown Clem, 34, did recently, when he joined forces with his longtime client and friend Lora Appleton to launch Kinder Modern, an online marketplace selling vintage 20th-century children's furniture, all hand-selected at antiques fairs and auctions here and abroad, plus a smattering of new works commissioned from contemporary designers. "It's really a perfect example of an idea that when it finally comes out, it's like, Oh my gosh, why didn't I think of that! But to bring it together as a concept was brilliant," remarks architect Alexander Gorlin, one of this year's Young Guns panelists, about Clem's dual business. In the two-minute biography above, Clem talks about cutting his chops under Amy Lau, the evolution of Bachman Brown Design, his full-service interior design firm (Gorlin describes its overall aesthetic as "fresh eclecticism"), and why, exactly, he decided to corner the market on Mad Men-era play tables for tots. Do have a look.