Who: Sarah Kunst
Age: 28
What She Does: Investor board member at Venture for America
Why She's Successful: "My age levels the playing field. People who never normally talk to me—like the CEO of a Fortune 500 company—ask to pick my brain about what Snapchat is or how Tinder works. It's a cool advantage."

Credits: Coat, $3,545, Opening Ceremony; (212) 219-2688. Top, $69, Ann Taylor; anntaylor.com. Skirt, $1,590, Akris; akris.ch for stores. Necklace, $195, Jennifer Fisher; jenniferfisher jewelry.com. Pink-gold ring, $1,350, Bulgari; (800) BVLGARI. Double-band ring, $175, Campbell; shopbop.com.

Who: Brooke Lampley
Age: 34
What She Does: SVP, head of Impressionist and modern art at Christie's
Why She's Successful: "I spend half my time traveling, at least a day or two a week. I can be in London for an auction, then off to Milwaukee to see a collection, then straight to Los Angeles to meet with a client. Then I'll take a red-eye to New York so I can be back in the office by morning."

Credits: Top, $250, White House Black Market; whbm.com. Skirt, $545, Boss; (800) HUGOBOSS. Sunglasses, $435, Céline; celine.com for stores. Bracelet, $275, Campbell; latestrevival. com. Stacked rings, $22.90 for five, Express; express.com. Band ring, $575, David Yurman; (212) 752-4255. Earrings, necklace & ring on left hand, Lampley's own.

Who: Marti Adams
Age: 30
What She Does: First deputy press secretary for NYC Mayor Bill de Blasio
Why She's Successful: "The first thing I do each morning is grab my BlackBerry to check for breaking news. I've definitely had those early mornings when my hair is still wet and I'm getting a phone call from the mayor. I have to read everything before I see him."

Credits: Jacket, $179, Ann Taylor; anntaylor.com. Top (worn as dress), $1,290, Derek Lam at Barneys New York; (212) 826-8900. Turtleneck, price upon request, Derek Lam; (212) 493-4454. Earrings, her own; (212) 752-4255. Gold cuff, $195, Miansai; miansai.com. Textured bracelet, $39.50, Ann Taylor; anntaylor.com. Wraparound ring, $350, snake ring, $770, Zoe Chicco; bloomingdales.com. Shoes, $625, Christian Louboutin; christianlouboutin.com. Ring on left hand, Adams' own.

Who: Mallory Blair and Bianca Caampued
Age: 26 and 30
What They Do: Founders of Small Girls PR (which counts Meetup, AOL, and Lulu among its clients)
Why They Are Successful: "I chose this career because it's a natural extension of my personality. I would be doing this even if I weren't being paid to do it."—Blair (Left) "Our social life and work life are one and the same. We're in-the-know with the 20-something Millennials our clients are trying to reach." —Caampued

Credits on Blair: (left): Sweater, $525, Band of Outsiders at Neiman Marcus; (888) 888-4757. Shirt, $69, Ann Taylor; anntaylor.com. Skirt, $795, Band of Outsiders; (212) 965-1313. Socks, $6.50, Hue; hue.com. Shoes, $775, Emporio Armani; armani.com.

Credits on Caampued: Jacket, $348, Ann Taylor; anntaylor.com. Top (worn as dress), $695, MM6 Maison Martin Margiela; (646) 781-7852. Pointed ring, $369, flat ring, $515, Meadowlark; meadowlark jewellery.com. Double-band ring, $1,425, Selin Kent; roseark.com. Boots, $850, Alexander Wang; (212) 977-9683.

Who: Morgan Murphy
Age: 32
What She Does: Writer and producer of CBS' 2 BROKE GIRLS
Why She's Successful: "Jimmy Kimmel, one of my first bosses, threw me into the fire at a young age and forced me to pitch my jokes to a room full of older men. Now I'm not afraid to try out new things—that's the only way you're going to prove yourself."

Credits: Jacket, $2,540, Miu Miu; miumiu.com for stores. Jersey, $20, vintage from LTV Salvaged and Upcycled Goods; (718) 858-4906. Pants, $98, Ann Taylor; anntaylor.com. Shoes, $625, Christian Louboutin; Christian louboutin.com.

Related:

Women CEO's Get the Job Done Better Than Men...and Here's Why
5 Secrets from the Highest Paid Women
Success Secrets of 30-Something Moguls

Photos via Steven Brahms

What Do You Think?