James B. Breckinridge is Adjunct Professor in the College of Optical Sciences at the University of Arizona and Astronomy Visiting Associate at Caltech. After earning his BS in physics at Case Western Reserve University and his MS and PhD in optical sciences at the University of Arizona, he was an
astronomical research assistant at Lick Observatory and later Kitt Peak National Observatory. Aden Meinel served on Breckinridge's MS advisory committee at the University of Arizona, and Marjorie and Aden both worked for him for eight years at NASA/JPL before they retired.

Alec M. Pridgeon recently retired from the Royal Botanic Gardens, Kew, where he specialized in DNA sequencing and molecular phylogenetics. He has edited and contributed to a six-volume series on Genera Orchidacearum. Pridgeon earned his BA in philosophy at the University of Michigan and his PhD in
biology at Florida State University.