- BBC, Wednesday, September 21, 2016 6:21 AM
Wearing a light-coloured checked shirt and shorts, with a soft English accent, Cal Henderson delivers a harsh truth. "It probably would have been impossible to
start Slack in the UK." Slack, a workplace communications tool that was valued earlier this year at $3.8bn, is unquestionably one of San Francisco's hottest startups. And in addition to Henderson, the
company is peppered with British talent.
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