Jennifer Simmerer stands with Chris Sneden before thier poster 91.10 at the Washington Meeting of the American Astronomical Society: "The Rise of the s Process" [BAAS 33, 1438 (2001)]. This poster shows how heavy-element abundances in metal-poor red giants shift from an early r-process dominance to equal s and r components near [Fe/H] >-1.5. 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. Sneden conducted several decades of observations of metal-poor stars to establish the basis of element abundances in them. See "1984 Dufour & Lambert" for a photo of Sneden's great colleague in this effort at Univ. of Texas, David Lambert.
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