Younger joined the company in April 2016, but left her Cambridge-based role to pursue other opportunities in the middle of last month. Previously of rival GSK and Deutsche Bank, Younger was mostly recently at FTI Consulting.
Rich Buckley, currently VP of corporate affairs for North America, will take up the global role on 16 April.
The firm is also seeking a new head of global media relations, PRWeek has learned, after Neil Burrows, who arrived in December 2015, left the team after a year in post. Burrows took up a media relations role at mining and resources company BHP Billiton last month.
A 13-year veteran of AstraZeneca, Buckley previously worked for pharma firm Eli Lilly, and before that the Pharmaceutical Research and Manufacturers of America (PhRMA), and the US Senate.
In his new role, Buckley will report directly to Mark Mallon, EVP of global product and portfolio strategy, global medical and corporate affairs.
- Esra Erkal-Paler, the firm's UK-based global head of external comms, was ranked as one of the most powerful healthcare comms professionals in the 2017 PRWeek UK Power Book.