With the next generation of Jaguar models Callum took Jaguar away from the Lawson-era retroism, which produced the more traditional-looking X-Type, S-Type, and XJ, towards a new style. This began with the 2006 XK, which bears striking similarity to the Aston Martin DB9, which Callum describes as being a result of modern safety legislation. This new direction continued with the 2008 XF as previewed by the concept C-XF, which Callum describes as the 'next significant step forward' in Jaguar's design direction, and the 2010 XJ. He also oversaw the design for the 2010 C-X75 concept car, the 2012 refresh of the Jaguar XF and introduction of Sportbrake, the 2013 F-Type, the 2015 Jaguar XE, 2015 second generation Jaguar XF (the first Callum-led design to replace another Callum-led design), the 2016 Jaguar F-Pace, and the 2018 Jaguar I-Pace.