article_snippet: 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.
article_snippet: 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.
article_snippet: Executives: Callinicos's planned departure was confirmed in an email by Uber's CEO Travis Kalanick (left).
article_snippet: Callinicos thanked Uber and Callinicos talented colleagues, and said Callinicos was stunned by this amazing company's success over the past two years.
article_snippet: Callinicos added that Callinicos will be staying on as an advisor at the firm. '
article_snippet: Kalanick's email, which was seen by Reuters and Mashable, also referred to Callinicos's desire to spend more time with Callinicos family - and said Callinicos had done a 'wonderful' job at the firm.
article_snippet: Callinicos, who lives in California's San Francisco Bay Area with his family, is one of the highest ranked executives to leave Uber.
highlights_snippet: Uber's Chief Executive Travis Kalanick confirmed departure in an email .
  
highlights_snippet: Replacement for Callinicos is yet to be announced by online taxi service .