No reason was given for the departure.
Biogen will also halt marketing of Aduhelm.
O'Neill was most recently chief medical officer at Sarepta Therapeutics.
Sandrock spent 23 years at Biogen, where he was head of R&D and chief medical officer.
Hannon, currently President of Altus Analytics, will succeed Mike Gordon on April 1, 2022.
Quest Diagnostics DGX finished a challenging 2021 with a strong fourth quarter that modestly beat analyst estimates.
Microsoft Corporation has hired Manik Gupta, the former chief product officer at Uber Technologies, as part of a renewed effort to boost its consumer app business.
On Tuesday, the software giant announced that Gupta will serve as its new corporate vice president for Teams Consumer, Skype and GroupMe, reporting directly to Jeff Teper, corporate vice president of Microsoft 365 Collaboration.
Norwegian Air Shuttle ASA (OTC: NWARF) named Geir Karlsen as its new chief executive officer Monday, a day after the company’s board decided to immediately terminate the contract with former head Jacob Schram.
In a statement, Norwegian Air’s board chair Svein Harald Øygard said Karlen – the company’s chief financial officer – “has the competencies, focus, trust and dedication that makes him the best choice” to lead the Oslo-based airline.
Italian luxury sports carmaker Ferrari N.V. has appointed Benedetto Vigna, a longtime executive at Europe’s largest semiconductor manufacturer, as its new chief executive officer.
Vigna, 52, will start at Ferrari on September 1, after more than 25 years at STMicroelectronics, where he currently runs the company’s analog, micro-electromechanical systems and sensors group.
Apollo Global Management Inc said on Thursday co-founder Josh Harris has decided to step down from his day-to-day role as managing director on completion of the private-equity giant's deal with Athene Holding Ltd.
Harris will "return to his roots" as an investor and entrepreneur, Apollo said, adding that he will remain on the company's board and its executive committee.