Alan Garen is geneticist, who co-discovered suppressor mutations for tRNA. The Garen lab also showed that certain triplet codons (5'-UAG, 5'-UAA, and 5'-UGA) failed to bind amino acids. Thus, the Garen lab and Brenner labs are both credited with discovery of the stop codons of the genetic code. Garen is currently a professor at Yale University. He is a member of the National Academy of Sciences and the American Academy of Arts and Sciences.