[4] After his research, Jüni returned to the University Bern, where he founded their clinical trials unit in 2007 and became Director of the Institute of Social and Preventive Medicine in 2013.
[6][7] Jüni was part of the Ontario COVID-19 Science Advisory Table, sitting on the Drugs & Biologics Clinical Practice Guidelines Working Group,[4] and serving as the Scientific Director from July 2020 to May 2022.
He has further acted as an unpaid member of steering groups or executive committees of clinical trials for Abbott Vascular, St. Jude Medical, and Terumo.
[2][12] Jüni was a principal investigator on a study called Coagulopathy of COVID-19: a Pragmatic Randomized Controlled Trial of Therapeutic Anticoagulation versus Standard Care funded by a joint grant from Defence Research and Development Canada, the Department of National Defence, St. Michael's Hospital Foundation, St. Joseph's Health Centre Foundation, and the International Network of Venous Thromboembolism Clinical Research Networks (INVENT).
"[17] He is also a co-investigator on a study titled Identifying strategies to (re)build trust in Canadian social institutions and increase public acceptance of COVID-19 countermeasures.