Kernahan was previously president of Hotwire North America and Australia and president of Eastwick.
Clarity PR has bought consumer tech PR firm Dynamo - the "first of a series of acquisitions" planned by the London-based agency.
The company launched a campaign with Prosek Partners, which it hired this summer.
How did you interpret the viral spot? Take our poll.
DJs Diplo and Sita Abellán also showed up at its LA launch event.
Golin will lead Twitter North America's consumer brand and product communications, including earned storytelling strategy across print and digital media, social and influencer work.
The Winklevoss twins are also among BlockFi's early investors.
The appraisals will help companies get the most out of their comms and marketing campaigns, the platform said.
Google has promoted Lily Lin to VP of communications and public affairs.
Fourteen million students and alumni use the platform.
The group has been one of chief communications officer Anne Marie Squeo's top priorities.
Zeno Group is the incumbent on the bulk of Salesforce's communications work.
'Unbelievable, look what just fell out of the sky,' one resident says.
The platform allows brands to tap into a firehose of creativity, but it's not without controversy.
Away designs and manufactures high-end luggage.