The longest-serving Senate President of the Fourth Republic (2007–2015).
Record in office
A timeline of documented achievements and major decisions, each with its source.
Senate President
5 Jun 2007 – 6 Jun 2015 · PDP
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2010
Led the Senate's "doctrine of necessity" resolution
In February 2010 the National Assembly made Vice-President Jonathan acting president while President Yar'Adua was ill abroad.
Source: Wikipedia: David Mark
Ken Nnamani
“Documented” means reported by reliable public sources. “Claimed” means stated by the office holder or their team but not independently confirmed. “Disputed” means credible sources disagree.