People committed to serving you

Like the team introduced below, all of our field technicians and office staff are committed to helping you before, during and after your tests.

Directors and project managers

Nadège Tollari, Geo., Ph.D.


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Nadège Tollari obtained a Ph.D. in mineral resources from Université du Québec à Chicoutimi in 2008 and is a member of the Ordre des géologues du Québec. She worked as an administrative assistant at Saguenay-based broker Services Immobilier Image 2000 from 2006 to 2008. Nadège subsequently held a variety of positions in the mining industry—including geologist assigned to corporate affairs; vice-president of research and development, vice-president of corporate affairs, project analyst coordinator of program development and sustainable development at Arianne Phosphate Inc. and Mine Arnaud. Nadège joined Multitest in August 2015 and has been a co-owner and vice-president of the company since December 2016. In February 2023, President after Nicolas and Guy Forest departure.

Krystel Segura, M.Sc.


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Krystel Segura obtained a master’s degree in natural resources geology in 2011. She began her career in France, where she oversaw quarry materials extraction, and was subsequently involved in mining exploration in the Abitibi region between 2011 and 2013. She oversaw a geomatics study for natural risks (2014–2015) in France and worked as a technician for an asbestos detection laboratory (2015–2016). Krystel became co-owner and Vice-President after Nicolas and Guy Forest departure.

Sabrine Metahni, Ph.D.Env.

Project manager

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Sabrine Metahni has completed her Ph.D. degree in earth sciences from National Institute of Scientific Research (INRS) Water, Earth and Environment in 2020. She had a strong involvement in several projects (2011-2020), in remediation of soils contaminated by organic and inorganic compounds. Her academic training and relevant experience in the field allow Sabrine to have a solid understanding of the different types of testing that we provide.

Mélanie Mathieu, GIT, M.Sc.

Project manager

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Mélanie Mathieu holds a bachelor’s degree in geology from the Université du Québec à Montréal obtained in 2018 and is a member of the Ordre des géologues du Québec as a geologist in training. She finished her master’s degree in seismology in 2021, a field of geology in which she has been working since 2017. In parallel with her studies, Mélanie has worked for more than 6 years in retail, which has allowed her to develop a great experience in customer relations and team management. Mélanie joined the Multitest team in April 2021.

Isabelle David, B.B.A.

Administrative director

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Isabelle David obtained a degree in business administration in 1993 and completed a graduate diploma in management in 2000 at Université du Québec à Montréal. She has more than 23 years of experience in the construction industry. Isabelle was a senior manager at Les Entreprises David Gauthier Leclair Inc. from 1993 to 2015. She has also sat on the board of La Mère Veilleuse early childhood centre as treasurer for more than five years.

Estelle Marcotte-Joncas, M.Env

Consultant in sustainable development and carbon neutraliy

Estelle Marcotte-Joncas obtained her master’s degree in environmental management and sustainable development in 2019 and she also got her bachelor’s degree in chemistry in 2017. Former project manager at Multitest, Estelle combines her knowledge of the company with her desire to encourage achieving our commitments to the environment and our carbon neutrality ambition. She carried out our very first carbon inventory in 2019 in collaboration with our team.You can also consult our commitments and our achievements clicking here:
our commitment to the environment