Early career at Associated Newspapers Following his education, Harmsworth joined the family business,
Associated Newspapers, a subsidiary of DMGT. He progressed through various operational roles within the organization, including positions at regional newspapers and corporate management. In the early 1990s, he was appointed managing director of the
Evening Standard, then owned by DMGT, gaining experience in newspaper management ahead of his eventual assumption of group leadership. Jonathan Harmsworth immediately succeeded his father as 4th Viscount Rothermere and chairman of DMGT, assuming control of the media conglomerate just before his 31st birthday. In September 2021, DMGT completed the sale of its insurance intelligence division, Risk Management Solutions (RMS), for £1.4 billion, marking a major restructuring of the group.
Privatisation of DMGT (2021–2022) In July 2021, Rothermere announced his intention to take DMGT private through his family investment vehicle, Rothermere Continuation Limited (RCL). The proposal, contingent on the sale of RMS and the listing of online car retailer Cazoo (in which DMGT held a 20% stake), offered 251 pence per share initially, later increased to 270 pence per share. The deal valued the company at approximately £850 million in cash terms, though the total package to shareholders exceeded £3 billion including the special dividend. Rothermere stated that privatisation would provide strategic flexibility and allow the company to focus on long-term value creation.
Leadership restructuring Following the completion of the privatisation, Rothermere briefly assumed the role of chief executive of dmg media (DMGT's consumer media division) in addition to his chairmanship. In March 2023, Tim Collier was appointed CEO of DMGT, allowing Rothermere to focus on broader strategic oversight. In 2023, Rothermere's eldest son, Vere Richard Jonathan Harold Harmsworth, who had joined the company in 2020, was appointed Director of Publishing Strategy for dmg media, continuing the family tradition of involvement in the business. ==Editorial policy and political influence==