The appointments are effective immediately, with Brown continuing to report to Michele Faissola, head of DeAWM, and to serve on DeAWM's global executive committee.
He also joins the UK executive committee, chaired by Colin Grassie, CEO of Deutsche Bank UK, which oversees all activity in the UK region.
With Brown’s appointment as country head, the UK becomes a separate region within DeAWM's organizational structure, alongside Germany; Asia Pacific; the Americas; and Europe, the Middle East & Africa (EMEA).
It was formerly run as part of the EMEA region. Based in London, Brown is responsible for leading DeAWM's business activities in the UK.
Michele Faissola, Head of DeAWM, said: "The UK is one of the world's most important markets for asset and wealth management.”
Brown most recently served as DeAWM's Co-Chief Investment Officer alongside Asoka Wöhrmann. Prior to this, he was the global head of Deutsche Insurance Asset Management.