Alary has published over 260 research papers and has produced major reports for the World Bank and UNAIDS about HIV in sub-Saharan Africa.

He also evaluated the Bill & Melinda Gates Foundation's India AIDS Initiative for which his project received the Avahan Recognition Award.

[5] Alary received his Diploma of College Studies in 1970, Doctorate in Medicine in 1974, and License from the Medical Council of Canada in 1975, from Université de Sherbrooke.

After receiving a Fellowship from the National Health Research and Development Program[6] and from the Fonds de la Recherche en Santé du Québec, Alary moved to Belgium and was associated with Institute of Tropical Medicine as a Post-doctoral fellow from 1991 till 1992.

[13] Form the mid 1990s till now, Alary led a longitudinal study about HIV and HCV prevalence and incidence among people who inject drugs (PWID) in the province of Quebec.

[16] In early 2000s, Alary conducted a research in Benin, about the management of sexually transmitted diseases and HIV prevention in men at high risk.

He studied the level of effectiveness of outreach methodology used in contacting sexual partners of FSWs in order to prevent HIV or STDs.

After studying the experiment results and the primary and secondary end points, it was found that the use of cellulose sulfate increased the risk of HIV acquisition instead of preventing the infection.

His study provided the required data about the key indicators such as uptake, retention and adherence, in context of early antiretroviral therapy and the pre-exposure prophylaxis (PrEP).

[20] From 2004 until 2014, Alary was appointed as the principal investigator for the evaluation of Avahan; a project regarding the in depth study of nature and heterogeneity of HIV transmission in India.

[21] During his appointment for Avahan, Alary developed a new approach for the impact evaluation of HIV prevention programs outside the context of randomized trials.