Uber president Jeff Jones is quitting after six months on the job because of concerns over the firm's management culture.CNN reported. "The beliefs and approach to leadership that have guided my career are inconsistent with what I saw and experienced at Uber،" Jones said in a statement. Jones was second in command to CEO Travis Kalanick، running Uber's ride-hailing operations، marketing and customer support. A former Target executive، he was named president at the end of August. His departure was first reported by Recode. "We want to thank Jeff for his six months at the company and wish him all the best،" Uber said in a statement. The startup started looking for a chief operating officer this month to work as the new No. 2 to Kalanick، who admitted he needed help leading the company after a series of crises.