Before revision:   Here we present a systematic method to prove 29 out of the first 100 Centers listed in Clark Kimberling's Encyclopedia are elliptic.
After revision:  Elegant proofs have surfaced for locus ellipticity of a few classic centers, however these are based on laborious case-by-case analysis. Here we present a systematic method to prove 29 out of the first 100 Centers listed in Clark Kimberling's Encyclopedia are elliptic.