Newson joined as part of a an investment management team of seven from Credit Suisse Asset Management.
Newson is understood to be on a sabbatical after Aberdeen Asset Management buying Goodman Property Investors for £89m on Friday.
Aberdeen, through wholly-owned subsidiary Aderdeen Property Investors Holding, will also pay £8.4m which is linked to the firm assets on completion of the deal at the close of business last Friday, with a further £12.5m dependent on asset flows in the next 12 months.
The deal brings Aberdeen Property Investors’ assets under management to £24bn.
An Aberdeen spokesman confirms Newson’s departure and says it is on amicable terms.
He says: “The acquisition of Goodwin sees a significant rise in our assets under management, making us a top 10 global player in terms of assets under management. The deal also brings in a team from Goodwin significantly raising our capabilities.”