• Home
  • Latest
  • Fortune 500
  • Finance
  • Tech
  • Leadership
  • Lifestyle
  • Rankings
  • Multimedia

Trendingnow

1

Jeff Bezos wants the bottom half of earners to pay zero income tax—he says nurses making just $75K should save $12K a year

2

Despite a $500 million net worth, Shaq just finished his fourth degree. He warns graduates: 'Your character will take you further than your resume'

3

Bolt CEO says he let go of his entire HR team for creating problems that didn’t exist: ‘Those problems disappeared when I let them go’ 

1

Jeff Bezos wants the bottom half of earners to pay zero income tax—he says nurses making just $75K should save $12K a year

2

Despite a $500 million net worth, Shaq just finished his fourth degree. He warns graduates: 'Your character will take you further than your resume'

3

Bolt CEO says he let go of his entire HR team for creating problems that didn’t exist: ‘Those problems disappeared when I let them go’ 
LeadershipUber Technologies

Read this Uber exec’s heartfelt resignation letter

By
Ben Geier
Ben Geier
Down Arrow Button Icon
By
Ben Geier
Ben Geier
Down Arrow Button Icon
March 17, 2015, 9:33 AM ET
Photo illustration of logo of car-sharing service app Uber on a smartphone over a reserved lane for taxis in a street in Madrid
The logo of car-sharing service app Uber on a smartphone over a reserved lane for taxis in a street is seen in this photo illustration taken in Madrid on December 10, 2014.Photograph by Sergio Perez — Reuters

Uber CFO Brent Callinicos resigned this week, and the note he sent to his colleagues at the startup is fairly emotional. The move echoes Google Chief Financial Officer Patrick Pichette’s recent good-bye note.

Callinicos starts by quoting philosopher John Dewey, and then gets right into the reason why he’s leaving:

Time has a way of passing quickly, easily leaving your heart’s desire to “maybe happen later.” For me, there is no later. It is now. It is time to do what I have desired for a very long time; time to keep a promise to my wife of not missing another school play, swim meet, or academic achievement of our daughter’s childhood. Time; time; time, to encapsulate what matters most to me; time, to admit that every day I work, I lose time with my family; time, to help my daughter understand how important time is before time becomes a blur to her too. It is simply time.

Uber CEO Travis Kalanick also sent a note about Callincicos’ leaving, in which he praised the CFO for helping get Uber to where it is today:

Almost 2 years ago, I brought on one of the great financial operators in Silicon Valley as our CFO. Though two years sounds short, Uber was a much smaller startup then – about 1/10th the size we are today. Brent has provided critical leadership to take Uber to the next level as we matured as a company. We have financial systems in place overseeing operations in 53 countries. We have a deep bench of talent poised to help our finance organization grow with the business.

Read both letters in their entirety at the Wall Street Journal.

About the Author
By Ben Geier
See full bioRight Arrow Button Icon

Latest in Leadership

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025

Most Popular

Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Finance
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam
By Fortune Editors
October 20, 2025
Fortune Secondary Logo
Rankings
  • 100 Best Companies
  • Fortune 500
  • Global 500
  • Fortune 500 Europe
  • Most Powerful Women
  • World's Most Admired Companies
  • See All Rankings
  • Lists Calendar
Sections
  • Finance
  • Fortune Crypto
  • Features
  • Leadership
  • Health
  • Commentary
  • Success
  • Retail
  • Mpw
  • Tech
  • Lifestyle
  • CEO Initiative
  • Asia
  • Politics
  • Conferences
  • Europe
  • Newsletters
  • Personal Finance
  • Environment
  • Magazine
  • Education
Customer Support
  • Frequently Asked Questions
  • Customer Service Portal
  • Privacy Policy
  • Terms Of Use
  • Single Issues For Purchase
  • International Print
Commercial Services
  • Advertising
  • Fortune Brand Studio
  • Fortune Analytics
  • Fortune Conferences
  • Business Development
  • Group Subscriptions
About Us
  • About Us
  • Press Center
  • Work At Fortune
  • Terms And Conditions
  • Site Map
  • About Us
  • Press Center
  • Work At Fortune
  • Terms And Conditions
  • Site Map
  • Facebook icon
  • Twitter icon
  • LinkedIn icon
  • Instagram icon
  • Pinterest icon

Latest in Leadership

Beyond the diploma: Skills that actually get graduates hired
Future of WorkWorkplace Innovation Summit
Beyond the diploma: Skills that actually get graduates hired
By Ashley LutzMay 22, 2026
7 hours ago
satya nadella
AITech
Microsoft reports are exposing AI’s real cost problem: Using the tech is more expensive than paying human employees
By Jake AngeloMay 22, 2026
7 hours ago
She grew Salesforce’s team by 600% in South Asia. Meet one of India’s most powerful women
NewslettersMPW Daily
She grew Salesforce’s team by 600% in South Asia. Meet one of India’s most powerful women
By Angelica AngMay 22, 2026
8 hours ago
Svenja Gudell, chief economist at Indeed
SuccessWorkplace Innovation Summit
Indeed chief economist says we’re entering an era of ‘great mismatch’ thanks to a generational imbalance of workers
By Emma BurleighMay 22, 2026
8 hours ago
Steve Wozniak
SuccessCareers
Apple’s Steve Wozniak says he cofounded the tech giant after 5 rejections from HP—not to ‘make money.’ For years, his paycheck was just $50
By Preston ForeMay 22, 2026
9 hours ago
A year in the life at HP: What matters to its sustainability lead in May 2026? 
EuropeHP
A year in the life at HP: What matters to its sustainability lead in May 2026? 
By Francesca CassidyMay 22, 2026
13 hours ago

Most Popular

Jeff Bezos wants the bottom half of earners to pay zero income tax—he says nurses making just $75K should save $12K a year
Success
Jeff Bezos wants the bottom half of earners to pay zero income tax—he says nurses making just $75K should save $12K a year
By Preston ForeMay 21, 2026
1 day ago
Despite a $500 million net worth, Shaq just finished his fourth degree. He warns graduates: 'Your character will take you further than your resume'
Success
Despite a $500 million net worth, Shaq just finished his fourth degree. He warns graduates: 'Your character will take you further than your resume'
By Preston ForeMay 20, 2026
2 days ago
Bolt CEO says he let go of his entire HR team for creating problems that didn’t exist: ‘Those problems disappeared when I let them go’ 
Workplace Culture
Bolt CEO says he let go of his entire HR team for creating problems that didn’t exist: ‘Those problems disappeared when I let them go’ 
By Preston ForeMay 19, 2026
3 days ago
Pay transparency is exposing a bigger problem: Most companies can't explain why they pay what they pay
Workplace Culture
Pay transparency is exposing a bigger problem: Most companies can't explain why they pay what they pay
By Sydney LakeMay 20, 2026
2 days ago
McKinsey partner says up to 50% of work hours could be transformed within the next 5 years
AI
McKinsey partner says up to 50% of work hours could be transformed within the next 5 years
By Emma BurleighMay 21, 2026
1 day ago
A 'proudly autistic' workplace expert says putting neurodivergent employees in a typical office is like dropping a polar bear in Austin, Texas
Conferences
A 'proudly autistic' workplace expert says putting neurodivergent employees in a typical office is like dropping a polar bear in Austin, Texas
By Tristan BoveMay 20, 2026
2 days ago

© 2026 Fortune Media IP Limited. All Rights Reserved. Use of this site constitutes acceptance of our Terms of Use and Privacy Policy | CA Notice at Collection and Privacy Notice | Do Not Sell/Share My Personal Information
FORTUNE is a trademark of Fortune Media IP Limited, registered in the U.S. and other countries. FORTUNE may receive compensation for some links to products and services on this website. Offers may be subject to change without notice.