Lejeune was a servant of life, love and truth, postulator says

One of the most important “servants of life in the world” was the late French geneticist, Jérôme Lejeune, who dedicated his “scientific genius” to serving children with Down syndrome and their families, said the woman officially promoting his sainthood cause.

Vatican publishes regulations for official promoters of sainthood causes

To avoid any appearance of impropriety or undue influence, a cardinal or bishop who is a member of the Congregation for Saints’ Causes and anyone officially appointed as a consultant to the congregation cannot serve as the postulator or official promoter of a candidate’s cause for sainthood.