When the Great Recession hit the U.S. economy in 2008, serial entrepreneur Sue Marks assessed the future, gulped and made big changes at Cielo, the Brookfield-based human resources firm she founded in 2005 under the name Pinstripe. 

And while she didn’t turn the company upside down, she did invest more than $1 million in a new technology platform, Marks said Wednesday morning in the keynote talk at the 2015 Early Stage Symposium. Organizers said the gathering is expected to draw more than 600 people over its two-day run.

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