Lifetimes and Mixing at DØ

We present results on b hadron lifetimes and mixing using large samples of single and dimuon data collected by the DO detector operating at the Fermilab Tevatron. We focus on the exciting possibilities available at hadron colliders due to the diversity in produced hadron species and the unprecedented production cross-sections. This is illustrated with benchmark measurements such as lifetime ratios and the B d mixing frequency. Expectations for key measurements such as the B s mixing parameters with larger data samples are also discussed.