Mitchell A. Gaff, 68, acknowledged killing two women who were sexually assaulted before being found dead in their Washington ...

Detectives used a clever gum ruse to collect DNA from Mitchell Gaff, who pleaded guilty to two decades-old cold case murders in Snohomish County court.

Twenty years after the introduction of the theory, we revisit what it does—and doesn’t—explain. by Clayton M. Christensen, Michael E. Raynor and Rory McDonald Please enjoy this HBR Classic. Clayton M.

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...