"Preeminent scientists" refers to highly respected and esteemed scientists who are considered to be at the forefront of their field, recognized for their significant contributions, accomplishments, and expertise. Full definition
The first woman in the world to receive a PhD in meteorology, and formerly of NASA, who has authored more than 190 studies and has been called «among the most preeminent scientists of the last 100 years». (drtimball.com)
As a scientist I remain skeptical.â $ —  Atmospheric Scientist Dr. Joanne Simpson, the first woman in the world to receive a PhD in meteorology  and formerly of NASA who has authored more than 190 studies and has been called â $ œamong the most preeminent scientists of the last 100 years.â $   (globalclimatescam.com)
And so we went to Scientific American's board of advisors and said to them, «Hi folks what» — you know these are some of the most preeminent scientists in the world today, and we said to them «what do you see ending and what beginnings are you seeing?» (scientificamerican.com)