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I'm Leo Grosjean, AI Product Manager at Opella (Sanofi Consumer Healthcare). I run the in-house Marketing Mix Modeling platform, built on Google Meridian, and I'm the bridge between marketing and finance teams and the models. The question behind it all: where does the next euro of media stop paying back?
Before Opella, I led marketing data analytics at Laboratoires Servier and spent three years as a data scientist at Ekimetrics, mostly on client sites. I studied applied mathematics at Centrale Paris. Based in Marseille, working in English and French.
EXPERIENCE
Opella2025–now
AI Product Manager · Sanofi Consumer Healthcare
Product lead for the in-house MMM platform on Google Meridian, across 15+ markets and 4 brands.
Demos, POCs and training sessions that drive adoption with marketing and finance teams.
Built an AI ROI assistant (FastAPI, TypeScript, Slack) so non-technical users can query the Bayesian models.
Laboratoires Servier2022–2024
Senior Data Scientist, then Marketing Data Analytics Lead
Designed the company's Marketing Analytics Platform on Google Cloud (Kubernetes, Vertex AI, BigQuery) with marketing, sales and IT.
Built the prototypes that proved its value: HCP scoring and customer clustering.
Ekimetrics2018–2021
Senior Data Scientist
Technical referent for retail, energy and transport clients. Helped shape the ML offering.
Lead Scoring. Deep-learning model predicting which prospects will book, built and deployed solo on Google Cloud.
Consumer Loop. NLP on e-commerce reviews to feed consumer feedback back to the brand. Led a team of data scientists and engineers.
Site Finder. Geomarketing tool on an interactive map of France: click any spot to estimate the revenue a new restaurant could generate there, from geographic and demographic KPIs. Built for Sales and Finance teams.
SIDE PROJECT
A household AI agent built on the Claude Agent SDK.
EDUCATION
Centrale Paris, MSc in Applied Mathematics for Healthcare and Business Strategy, 2014–2018. Université Paris-Saclay, university diploma in biomedical training, 2017–2018.