Alexander Refsum Jensenius

{{short description|Norwegian researcher and musician (born 1978)}}

{{Infobox person

|name = Alexander Refsum Jensenius

|image = Alexander Refsum Jensenius with fNIRS.jpg

|image_size =

|caption = Jensenius with an fNIRS cap

|birth_date = {{Birth date and age|df=y|1978|11|10}}

|birth_place = Asker, Norway

|nationality = Norwegian

|education = University of Oslo, Chalmers University of Technology

|employer = University of Oslo

|occupation = Music Technologist

|title = Professor

|awards =

|website = {{URL|https://www.arj.no/}}

}}

Alexander Refsum Jensenius (born 10 November 1978) is a Norwegian researcher and musician. He is Professor of music technology and Director of [https://www.hf.uio.no/ritmo/english/ RITMO] - Centre for Interdisciplinary Studies in Rhythm, Time and Motion at the University of Oslo, and Director of the Center for AI & Creativity that was awarded 200 million NOK in 2025.{{Cite web |last=Lystad |first=Elise |last2=Svarstad |first2=Jørgen |date=2025-06-11 |title=Slik skal KI-milliarden brukes. Her er de nye KI-sentrene |url=https://www.khrono.no/slik-skal-ki-milliarden-brukes-her-er-de-nye-ki-sentrene/975936 |access-date=2025-06-11 |website=www.khrono.no |language=nb-NO}} He was Head of the Department of Musicology at the University of Oslo from 2013 to 2016 and served as the Chair of the Steering Committee for NIME, the International Conference in New Interfaces for Musical Expression from 2011 to 2022. He is the grandson of politician Marie Borge Refsum and brother of Francesca R. Jensenius.

Jensenius is educated in music, computer science, physics and mathematics. He was awarded a Master of Arts degree (cand.philol.) in Music technology by the University of Oslo in 2002,{{cite book | last = Jensenius | first = Alexander Refsum | title = How do we recognize a song in one second? -The Importance of Salience and Sound in Music Perception | url = http://www.duo.uio.no/sok/work.html?WORKID=7704&fid=3563 | year = 2002 | publisher = University of Oslo | location = Oslo }} and was awarded a doctorate by the same institution in 2008.{{cite web | url = http://www.hf.uio.no/forskning/dok-disp/2008/jensenius.html | archive-url = https://archive.today/20130222213727/http://www.hf.uio.no/forskning/dok-disp/2008/jensenius.html | url-status = dead | archive-date = February 22, 2013 | title = Musikk er bevegelse | access-date = 2009-06-11 | date = | publisher = University of Oslo | language = Norwegian }}{{cite book | last = Jensenius | first = Alexander Refsum | title = Action-sound: developing methods and tools to study music-related body movement | url = http://www.duo.uio.no/sok/work.html?WORKID=69475&fid=37323 | year = 2007 | publisher = University of Oslo | location = Oslo }} In addition he holds a Master of Science degree in applied information technology from Chalmers University of Technology in Gothenburg. He has been guest researcher at University of California, Berkeley and McGill University in Montreal.{{cite web | url = http://www.arj.no | title = Alexander Refsum Jensenius | access-date = 2009-06-11 | archive-url= https://web.archive.org/web/20090623050219/http://www.arj.no/| archive-date= June 23, 2009 | url-status= live}}

Jensenius received unusually high media attention when he finished his doctorate. Several newspapers and TV stations named him "Dr Air guitar".{{cite web | url = http://www.nrk.no/musikk/1.4654615 | title = Doktorgrad på luftgitar | access-date = 2009-06-11 | last = Gjersøe | first = Jørn | date = January 28, 2008 | publisher = NRK | language = Norwegian}} This was based on his research into musical gestures. He had developed a new technology for the analysis of movement. This technology is both used in music research and in psychological research on ADHD.{{cite web | url = http://www.nrk.no/programmer/tv/schrodingers_katt/1.4893999 | title = Avslører ADHD med luftgitar | access-date = 2009-06-11 | last = Grandaunet | first = Hilde E. Jensen |author2=Lars Ole Skjønberg | date = February 21, 2008 | publisher = NRK | language = Norwegian}}{{cite web | url = http://www1.nrk.no/nett-tv/indeks/123069 | archive-url = https://web.archive.org/web/20120930181755/http://www1.nrk.no/nett-tv/indeks/123069 | url-status = dead | archive-date = September 30, 2012 | title = Mener bevegelsene avslører ADHD | access-date = 2009-06-11 | date = February 21, 2008 | work = Newton (TV programme) | publisher = NRK | format = Video (Silverlight) | language = Norwegian | df = mdy-all }}

Alexander Jensenius was president of the Norwegian Association of Young Scientists from 1999 to 2001 and has also been project manager for European Space Camp at Andøya Rocket Range. He was a candidate for the board of the University of Oslo in 2007.{{cite web | url = http://www.admin.uio.no/ia/styrevalg/2007/kandidater/jensenius.html | title = Stipendiat Alexander Refsum Jensenius – CV og plattform – Styrevalget 2007 | access-date = 2009-06-11 | date = May 2, 2007 | publisher = University of Oslo | archive-url = https://archive.today/20070812072131/http://www.admin.uio.no/ia/styrevalg/2007/kandidater/jensenius.html | archive-date = August 12, 2007 | url-status = dead | df = mdy-all }}