Prof. Robert Vaßen is the leading expert for thermal barrier coatings

According to ScholarGPS ranking of scholars (based on specialties and lifetime achievements) Prof. Robert Vaßen is the world leading expert for Thermal Barrier Coatings still in activity:

https://scholargps.com/highly-ranked-scholars?year=2022&p_profile=1&ranking_duration=LIFETIME&base_specialty=Thermal+barrier+coating

Highly Ranked Scholars™ are the most productive (number of publications) authors whose works are of profound impact (citations) and of utmost quality (h-index). All scholars including inactive, deceased, and retired scholars are included.

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