Julien graduated in 2002 from the University of Bern in Switzerland. He became a diplomate of the American College of Veterinary Medicine in 2008 after completing a joint residency between Bern and Louisiana State University. Julien joined afterwards the University of Liverpool as Clinician teacher for 2 years. He then worked as a Consultant in Small Animal Medicine for IDEXX before undertaking a PhD at the University of Melbourne. He completed is PhD in 2019 about gastro-intestinal disease and monitoring of animals on treatment with immune suppressive drugs. Currently, Julien works as a lecturer at the University of Melbourne.