The move follows an earlier combination of the two agencies in Australia, and is part of a global restructure to 'turbocharge' iProspect as a second media network to Carat.
A network spokesperson said the change, which also sees the departure of Vizeum CEO Ashley Earnshaw, is for Australia only.
AGENCY REPORT CARD: See Vizeum's overall grade and our detailed report breaking down its 2019 performance in terms of leadership, creativity, innovation, business growth, and people/diversity initiatives.
The agency started the year with the exit of its Asia CEO, Duncan Pointer, and as parent company DAN struggled with wider challenges to its businesses, Vizeum struggled to be noticed amidst all the noise.
Three more high-level DAN executives are now known to have left the network following a major restructuring of media operations.
With leadership unstable and DAN's wider restructure plans rocking the boat, Vizeum didn't have the easiest year in 2018.
Top news, insights and analysis every weekday
Sign up for Campaign Bulletins