Bill Macaitis knows something about growth.

In his two years as Zendesk’s top marketer, he helped take the company from venture-funded startup to an IPO resulting in a $1.7 billion market cap.

When he led online marketing and operations at Salesforce, he helped grow revenues from $900M to $3 billion.

Now, he's the CMO at Slack, the 17-month old messaging startup that’s rumored already to be worth $2.76 billion.

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