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Catherine E. Costello is a pioneering figure in bioanalytical mass spectrometry, whose work has fundamentally reshaped the way researchers analyze complex biological molecules. Her research centers on the development and application of advanced mass spectrometric techniques for the structural characterization of glycoconjugates, lipids, and proteins. Costello’s major contributions include the direct analysis of sialylated and sulfated glycosphingolipids using TLC-MS interfaces, a method that has become essential for studying gangliosides and sulfatides—key players in neurological function and disease. She also advanced proteomics by coupling HPLC to MALDI-TOF MS with an on-target device, streamlining fraction collection, digestion, and desalting for high-throughput analysis. Her landmark 1999 review on bioanalytic applications of mass spectrometry (49 citations) helped catalyze the field’s expansion into biology and medicine, highlighting the transformative impact of electrospray ionization and MALDI. With hundreds of publications and a career spanning decades, Costello’s innovations have enabled deeper insights into lipidomics and glycobiology, earning her international recognition and a lasting legacy as a trailblazer in analytical chemistry.