He had numerous occasions in Calgary at a very young age to perform with local musicians as well as to accompany artists from abroad such as Sheila Jordan, Edgar Meyer, Hugh Fraser, Jens Lindemann, Dee Daniels as well as attending the Banff Centre for the Arts Jazz Workshop in 1996 under the direction of Kenny Wheeler.

This included a number of eclectic albums recorded and produced with the gracious help of the Banff Centre for the Arts (listed in the discography) Moving to Europe in 2002, he has established himself as an international Canadian double bassist based in Paris, France.

He first appeared in Nguyên Lê's Fragile Beauty Group with Huong Thanh in 2007 and since, and later in a quartet with Rita Marcotulli and Danny Gottlieb as well as in many different formations of Nguyên Lê with Karim Ziad, Jan Bang, Bojan Zulfikarpasic, Rick Margitza, Paul McCandless, Rudresh Mahanthappa, Himiko Paganotti, Cathy Renoir, Alex Tran, and Mark Guiliana, Stéphane Galland, Françsis Lassus and Joel Allouche.

Other formations performing with Dhafer Youssef include with pianist Kristjan Randalu and drummers Chander Sarjoe and Ferenc Nemeth, guitarist Eivind Aarset, Turkish clarinetist Hüsnü Şenlendirici and cymbalum player Aytaç Dogan, Danish percussionist Marilyn Mazur and Norwegen trumpetist Nils Petter Molvaer, pianist Marcin Wasilewski and drummer Satoshi Takeishi.

Other projects as a side man include numerous projects with Turkish ney player Kudsi Erguner, as well as the El Gusto traditional Chaâbi orchestra, Slovenian pianist Marko Crncec with saxophonist Mark Shim and drummers Ludwig Afonso and Rudy Royston, the Thomas Enhco Trio, the Jacek Kochan/Dave Liebman Quartet in Eastern Europe, the Lee Konitz/Giovanni Ceccerelli Quartet, pianist Kenny Werner and Benjamin Koopel, Triple Horizon Trio with guitarist Florian Zenker and drummer Arie den Boer.

He has also worked with Seamus Blake, Yaron Herman, Valgeir Sigurðsson, John Hadfield, Omri Mor, Terumasa Hino, Kiyohiko Semba, Andy Milne, and Nelson Veras to name a few.

He has studied extensively with his mentors Dale James, Palle Danielsson, John Patitucci, as well as with Don Thompson, Ray Brown, Mark Johnson, Thomas Martin, Edgar Meyer, Hein Van de Geijn, Bruno Chevillon, François Rabbath, Cameron Brown, David Takeno, Menahem Pressler, Dave Young, Jim Vivian, and his first double bass teachers who got him off to the right start John Hyde and Dave Watts.