Jennifer Simmerer stands with Donald Clayton before her poster 91.10 at the Washington Meeting of the American Astronomical Society: "The Rise of the s Process" [BAAS 33, 1438 (2001)]. Clayton had established the quantitative theory of the s process four decades earlier (Annals of Physics 1961), and introduced in MNRAS 234, 1-36 (1988) the key idea about the contemporaneous growth of the s process (secondary, but showing primary behavior) in metal-poor stars during galactic evolution.

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