Billionaires

Workday Billionaire 'Bored Silly' of Retirement Chases a Third IPO

Dave Duffield hopes to complete an IPO hat trick with Ridgeline, which aims to replicate his success in HR software for the financial services industry. 

Dave Duffield

Photographer: Emily Najera/Bloomberg
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Dave Duffield keeps trying, and failing, to retire.

At 84, the billionaire co-founder of HR software firms PeopleSoft Inc. and Workday Inc. is building another startup after he became “bored silly” each time he stopped working.