Multrier will oversee Isobar's online media division in addition to his responsibilities as head of Isobar France.
He arrived at Isobar in 2006 from MRM Worldwide, where he managed the network's France office.
Separately, Isobar has appointed Antoine Leveque to lead its mobile practice.
Leveque, who is currently running Marvellous France, is a mobile specialist who has worked with brands such as Adidas, BBC and Warner
He will chair a cross-Isobar mobile committee, which will share knowledge and set the mobile strategy for the group.
These appointments form part of Isobar's new global structure that is designed to promote business development and knowledge sharing across the network.
Ralph Folz, chief operating officer of Isobar, said: "Within [Isobar], we have attracted many of the world's leading experts in digital to our senior ranks, either through recruitment or acquisition.
"This means that the diversity of our network's expertise, with our agency specialists distributed all over the world, is one of our biggest strengths. These discipline heads will be working closely with all our agencies across the globe to maximise both commercial performance and knowledge sharing."
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