In July 2009, he moved to BBC Radio 1 to take on the weekend breakfast show. In September, he moved from the weekend slot to replace Greg James as host of the weekday early breakfast show, between 4am and 6:30am. In March 2014, he left the weekday slot and returned to the weekend breakfast show, taking over from Gemma Cairney. He regularly presented The Radio 1 Breakfast Show (sitting in for Nick Grimshaw), the Scott Mills show and the Greg James show as a relief presenter. In 2018, he and Alice Levine began hosting their own show, Dev & Alice, in the weekend breakfast slot. The duo were moved to the weekend afternoon show the same year. On 9 August 2020 the final show aired, following the announcement of Levine's departure from Radio 1. In November 2020, BBC Radio 1 announced major scheduling changes for the end of 2020 and 2021. Griffin, along with Huw Stephens and Phil Taggart would not be rejoining the lineup in 2021. The latter two are not leaving the BBC all together, and are instead returning to their former shows on BBC Radio Cymru, BBC Radio 6 Music and BBC Radio Ulster respectively. Instead, Dev departed the BBC, and joined Heart after 18 years with the corporation. His last show was 13:00 - 16:00 on 20th December 2020. He made his Heart debut on Saturday 2 January 2021, when he launched his brand new show 12:00-16:00. As of January 2022, Dev presents Heart’s Evening Show from 7-10pm Monday to Thursday, replacing Mark Wright, who has moved back to weekends. Television In 2016, Griffin and Alice Levine competed in a BBC Bargain Hunt Children in Need special. They took on Radio 4’s Nick Robinson and Aasmah Mir. Griffin reached the final of the 2017 series of Celebrity Masterchef, alongside Ulrika Jonsson and eventual winner, Angellica Bell. Griffin participated in the 17th series of Strictly Come Dancing, partnered with professional dancer Dianne Buswell. They became the third Strictly couple to leave the show after losing a dance-off to Emma Weymouth and Aljaž Skorjanec. In April 2019, Griffin took part in the first series of Celebrity SAS: Who Dares Wins. In October 2020, Dev participated in a celebrity edition of The Chase. Radio presenting Heart’s Evening Show 7-10pm, January 2022 - Present (Heart) Heart’s Feel Good Weekend 12-4pm, Saturday, 2 January 2021 - Present (Heart) Weekend Afternoon Show