  I report results from the CLEO collaboration on semileptonic B decays,
highlighting measurements of the Cabibbo-Kobayashi-Maskawa matrix elements
|Vub| and |Vcb|. I describe the techniques used to obtain the recent
improvements in precision for these measurements, notably the use of the b -> s
gamma photon spectrum to constrain non-perturbative hadronic effects in
semileptonic B decays.
