Uber 's Chief Financial Officer has revealed he is stepping down from the online taxi service in an epic memo in which he says he is keeping a vow to spend more time with his wife and daughter . In the internal document , Brent Callinicos , 48 , who joined Uber Technologies Inc in 2013 after serving as treasurer and chief accountant at Google , writes : '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 . ' The planned departure of Callinicos - who oversaw the company 's fastest years of growth - was confirmed in an email by Uber 's Chief Executive Travis Kalanick , which was sent out to investors . Scroll down for video . Family man : Uber 's CFO Brent Callinicos ( pictured ) has revealed he is stepping down from the online taxi service in an epic memo in which he says he is keeping a vow to spend more time with his wife and daughter . A man of his word : Callinicos wrote that he had made a promise to his wife , Julie , not to miss another school play , swim meet , or academic achievement of their daughter , Alexi . Daddy 's girl : Callinicos wrote that he wants his daughter , who is in middle school , to 'understand how important time is before time becomes a blur to her too ' Successful : In the internal document , Brent Callinicos , 48 , who joined Uber Technologies Inc ( file picture ) in 2013 after serving as treasurer and chief accountant at Google , writes : 'For me , there is no later . It is now ' In the email , Kalanick said Guatam Gupta , 'Brent 's right hand on Strategic Finance ' , will be the acting head of the company 's finance division until a replacement is either found or named . Callinicos , who will stay on at Uber as an advisor and consultant , is the second financial head of a major Silicon Valley company in only a week to depart with a memo about prioritizing family . Last week , Google Chief Financial Officer Patrick Pichette announced in a Google+post that he was quitting his job to travel the world with his wife in what he described as a 'perfectly fine mid life crisis ' . In Callinicos inspiring memo , seen by the Wall Street Journal , the CFO quoted philosopher John Dewey : 'Time and memory are true artists ; they remold reality nearer to the heart ’ s desire . ' He went on to explain how it is time for him 'to encapsulate what matters most to me ' , such as helping his daughter 'understand how important time is before time becomes a blur to her too ' . 'After 26 years of nonstop work since MBA School , I am going to step back and spend some time with my family and let someone else take this amazing company to the next level as CFO , ' he said . Executives : Callinicos 's planned departure was confirmed in an email by Uber 's CEO Travis Kalanick ( left ) . Right , last week , Google CFO Patrick Pichette also left his job with a memo about prioritizing his family . 'My daughter is in middle school ; my wife has been supportively waiting to spend time with me for 28 years . I made a promise to both of them that I would be taking a long break at this stage of life . ' Callinicos thanked Uber and his talented colleagues , and said he was stunned by the company 's success over the past two years . He added that he will be staying on as an advisor at the firm . ' [ I ] will always be emotionally connected to this company . I will miss everyone here , but , like the rest of the world , I will watch and admire from the sidelines as I begin a new life with my family , ' he said . Kalanick 's email , which was seen by Reuters and Mashable , also referred to Callinicos 's desire to spend more time with his family - and said the businessman had done a 'wonderful ' job at the firm . Rise to popularity : Uber , which is valued at around $ 41billion ( compared to the $ 3.5 billion it was valued at when Callinicos joined the firm in 2013 ) , is now available in more than 53 countries and 200 cities worldwide . 'Brent has done a wonderful job here at Uber but has decided that it is time for his next journey , one where his wife and daughter take the front seat , ' the 38-year-old CEO wrote in the email . He added that Uber was around ' 1/10th ' of the size it is today when Callinicos joined the company . Callinicos , who lives in California 's San Francisco Bay Area with his family , is one of the highest ranked executives to leave Uber . He also previously worked for The Walt Disney Company . Gupta , who will be acting head of finance , is a former Goldman Sachs Group Inc vice president . Uber , which is valued at around $ 41billion ( compared to the $ 3.5 billion it was valued at when Callinicos joined the firm ) , is now available in more than 53 countries and 200 cities worldwide .
Brent ##erson , ex - Google chief executive , joined Uber two years ago . Oversaw the firm 's fastest years of growth ; it is now valued at $ 41billion . In internal memo , he revealed he is departing after making a vow to wife . ' It is going to do what I have desired for a very long time , ' said Callinicos . He said he intends to attend his daughter 's school plays and swim meets . apple 's Chief Executive mark Kalanick confirmed departure in an email . Replacement for Callinicos is yet to be announced by online dating sites .