Manley was educated as an engineer and started his career as a trainee at car financing company Swan National.

In 2008, Mr. Manley became Executive Vice-President of planning and sales for Chrysler followed by COO for the Asia region and then in 2009, he became the CEO of the Jeep division, a position which he held with FCA since the merger with Fiat, with the addition of becoming responsible for RAM.

[4] On 21 July 2018 Manley was appointed CEO of FCA,[4] as Sergio Marchionne stepped down for medical reasons.

[5] In December 2020 it was announced that Manley will lead the North American operations of Stellantis, once the FCA-PSA merger is finalized.

[6] He left Stellantis in September 2021 and starting November 2021 Manley began to serve as CEO of AutoNation of Ft. Lauderdale, Florida.