Robert K. Selander was an influential American evolutionary biologist whose work significantly advanced the field of molecular genetics. He served as an emeritus professor at Pennsylvania State University, where he dedicated much of his career to exploring the genetic diversity and evolutionary processes of various species. His research contributed to a deeper understanding of the mechanisms of evolution and the role of genetic variation in populations, paving the way for future studies in evolutionary biology. Selander's notable achievements included his election to the National Academy of Sciences in 1982, a testament to his impact on the scientific community. His studies not only expanded the knowledge of molecular genetics but also influenced the broader discourse on evolution, genetics, and conservation biology. Through his rigorous research and commitment to education, Selander left a lasting legacy in the field, inspiring generations of biologists to further investigate the complexities of life and evolution.