We explore empirical regularities of CiO suruiuability in public and private organizations using CiO job tenure durations spanning 1994 to 2009 for 1,594 executives. We employ the Kaplan-Meier estimator from event history analysis to compute survivor functionsfor CEOs, COOs, CFOs and CiOs. We make log rank comparisons of job tenure durations to make inferences within/across executive titles, and between public and private sector groups. The results suggest that: CiOs have shorter survival durations than CEOs and COOs, comparable to CFOs; private sector CiOs have longer durations than public sector CiOs; CiO membership in the top management team increases survivability; female CiOs stay a shorter time than males; and women on the top management team diminish CiO tenures overall. From an additional executive arrival and departure timeproximify analysis, we find that only a quarter of CiOs are members of the top management team, but membership lengthens tenure.