Rigorous peer-review is the cornerstone of high quality academic publishing. Over 155,000 scholars served as reviewers for MDPI journals in 2019. We are extremely appreciative of all those who made a contribution to the editorial process in this capacity. At the beginning of every year, journal editorial offices publish a list all reviewers’ names to express our gratitude. In addition, this year the “MDPI Top Reviewer Award” are announced, to recognize the very best reviewers for their expertise, dedication, high quality, and timely review reports. We are pleased to announce the following winners of the 2019 MDPI Top Reviewer Award: among the 20 recognized reviewers, Dr. Otilia MANTA is also present (source: MDPI).