Masses and Lifetimes of B Hadrons
  The latest measurements of the masses and lifetimes of weakly decaying $B$~hadrons from experiments at $e^+e^-$ and $p\bar{p}$ colliders are presented. These measurements include the lifetimes of the $\bar{B}^0$, $\bar{B}^0_s$, $B^-$, and $b$~baryons, as well as searches for the $B_c$~meson. The observation of $B^*$, p-wave B~mesons ($B^{**}$), and excited $b$~baryons using inclusive and exclusive $B$~hadron reconstruction are discussed. Results on $b$~quark flavour tagging are given. The latest measurements of the masses and lifetimes of weakly decaying $B$~hadrons from experiments at $e^+e^-$ and $p\bar{p}$ colliders are presented. These measurements include the lifetimes of the $\bar{B}^0$, $\bar{B}^0_s$, $B^-$, and $b$~baryons, as well as searches for the $B_c$~meson. The observation of $B^*$, p-wave B~mesons ($B^{**}$), and excited $b$~baryons using inclusive and exclusive $B$~hadron reconstruction are discussed. Results on $b$~quark flavour tagging are given. 
I. Joseph Kroll (Fermilab)