When they were young: 40 Under 40 childhood photos

JB Straubel, Tesla

Courtesy of JB Straubel
See the profile for J.B. Straubel, No. 2 on the 40 Under 40.

Ryan Graves, Uber

Courtesy of Ryan Graves
See the profile for Ryan Graves, No. 3 on the 40 Under 40.

Logan Green, Lyft

Courtesy of Logan Green
See the profile for Logan Green, No. 3 on the 40 Under 40.

John Zimmer, Lyft

Courtesy of John Zimmer
See the profile for John Zimmer, No. 3 on the 40 Under 40.

Dhivya Suryadevara, GM Asset Management, GM

Courtesy of Dhivya Suryadevara
See the profile for Dhivya Suryadevara, No. 4 on the 40 Under 40.

James Park, Fitbit

Courtesy of James Park
See the profile for James Park, No. 5 on the 40 Under 40.

Taylor Swift

Courtesy of TAS Rights Management
See the profile for Taylor Swift, No. 6 on the 40 Under 40.

Vas Narasimhan, Novartis Pharmaceuticals

Courtesy of Vas Narasimhan
See the profile forVas Narasimhan, No. 7 on the 40 Under 40.

Jason Robins, DraftKings

Courtesy of Jason Robins
See the profile for Jason Robins, No. 8 on the 40 Under 40.

Jason Buechel, Whole Foods

Courtesy of Jason Buechel
See the profile for Jason Buechel, No. 11 on the 40 Under 40.

Robby Mook, Hillary for America

Courtesy of Robby Mook
See the profile for Robby Mook, No. 12 on the 40 Under 40.

Noah Wintroub, J.P. Morgan Chase

Courtesy of Noah Wintroub
See the profile for Noah Wintroub, No. 13 on the 40 Under 40.

Hugo Barra, Xiaomi

Courtesy of Hugo Barra
See the profile for Hugo Barra, No. 14 on the 40 Under 40.

Jessica Alba, The Honest Company

Courtesy of Jessica Alba/Instagram
See the profile for Jessica Alba, No. 15 on the 40 Under 40.

Karen Fang, Bank of America

Courtesy of Karen Fang
See the profile for Karen Fang, No. 17 on the 40 Under 40.

Anand Swaminathan, Accenture Digital

Courtesy of Anand Swaminathan
See the profile forAnand Swaminathan, No. 18 on the 40 Under 40.

Lisa Falzone, Revel Systems

Courtesy of Lisa Falzone
See the profile for Lisa Falzone, No. 19 on the 40 Under 40.

Parker Conrad, Zenefits

Courtesy of Parker Conrad
See the profile for Parker Conrad, No. 20 on the 40 Under 40.

Will Ackerly, Virtru

Courtesy of WIll Ackerly
See the profile for Will Ackerly, No. 21 on the 40 Under 40.

Orion Hindawi, Tanium

Courtesy of Orion Hindawi
See the profile for Orion Hindawi, No. 21 on the 40 Under 40.

Jared Kushner, Kushner Companies

Courtesy of Jared Kushner
See the profile for Jared Kushner, No. 25 on the 40 Under 40.

Melanie Whelan, SoulCycle

Courtesy of Melanie Whelan
See the profile for Melanie Whelan, No. 26 on the 40 Under 40.

Kayvon Beykpour, Periscope

Courtesy of Kayvon Beykpour
See the profile for Kayvon Beykpour, No. 27 on the 40 Under 40.

Michelle Dipp, OvaScience

Courtesy of Michelle Dipp
See the profile for Michelle Dipp, No. 28 on the 40 Under 40.

Stacy Brown-Philpot, TaskRabbit

Courtesy of Stacy Brown-Philpot
See the profile for Stacy Brown-Philpot, No. 29 on the 40 Under 40.

Sam Altman, Y Combinator

Courtesy of Sam Altman
See the profile for Sam Altman, No. 30 on the 40 Under 40.

Chris Wanstrath, GitHub

Courtesy of Chris Wanstrath
See the profile for Chris Wanstrath, No. 31 on the 40 Under 40.

Debbie Sterling, GoldieBlox

Courtesy of Debbie Sterling
See the profile for Debbie Sterling, No. 32 on the 40 Under 40.

Brian Sheth, Vista Equity Partners

Courtesy of Brian Sheth
See the profile for Brian Sheth, No. 33 on the 40 Under 40.

Michael Dubin, Dollar Shave Club

Courtesy of Michael Dubin
See the profile for Michael Dubin, No. 34 on the 40 Under 40.

Andy Katz-Mayfield, Harry’s

Courtesy of Andy Katz-Mayfield
See the profile for Andy Katz-Mayfield, No. 34 on the 40 Under 40.

Jeff Raider, Harry’s

Courtesy of Jeff Raider
See the profile for Jeff Raider, No. 34 on the 40 Under 40.

Josh Goldin, Alliance Consumer Growth

Courtesy of Josh Goldin
See the profile for Josh Goldin, No. 35 on the 40 Under 40.

Julian Steinberg, Alliance Consumer Growth

Courtesy of Julian Steinberg
See the profile for Julian Steinberg, No. 35 on the 40 Under 40.

Trevor Nelson, Alliance Consumer Growth

Courtesy of Trevor Nelson
See the profile for Trevor Nelson, No. 35 on the 40 Under 40.

Julia Hartz, EventBrite

Courtesy of Julia Hartz
See the profile for Julia Hartz, No. 36 on the 40 Under 40.

Ashifi Gogo, Sproxil

Courtesy of Ashifi Gogo
See the profile for Ashifi Gogo, No. 38 on the 40 Under 40.

Reshma Saujani, Women Who Code

Courtesy of Reshma Saujani
See the profile for Reshma Saujani, No. 39 on the 40 Under 40.

Ronda Rousey, UFC

Courtesy of AnnMaria DeMars
See the profile for Ronda Rousey, No. 40 on the 40 Under 40.

To see the full list of the Fortune 40 Under 40, visit fortune.com/40-under-40.

For more Fortune photography follow us on Instagram at @fortunemag.