Accounts Casper Ships Media Account to Omnicom’s PHD Appointment comes ahead of DTC mattress company's upcoming IPO The mattress company's IPO filing puts its valuation at about $768.2 million. Casper By Erik Oster January 28, 2020 DTC mattress brand Casper has named Omnicom Media Group’s PHD as its media agency of record. Erik Oster @ErikDOster erik.oster@adweek.com Erik Oster is an agencies reporter for Adweek. Recommended articles