The advocate Duncan Hamilton has been appointed as a political adviser to First Minister Alex Salmond.
Duncan Hamilton previously served as an SNP MSP
Mr Hamilton will continue his legal work, but will be required to flag up any potential conflicts of interest.
He was named on a list of special advisers announced by the Scottish government, which also included veteran Nationalist Prof Sir Neil McCormick.
A total of nine advisors have been appointed, although several are part-time, unpaid or temporary.
The annual wage bill has been estimated at £425,156, but the SNP said the cost would be 45% less than the salaries paid to the previous Scottish Executive's team of 12.
Sir Neil, a former MEP, will advise on Europe on a part-time, unpaid basis while Mr Hamilton, who previously served as an MSP, will also work part-time.
The six full-time appointments were confirmed as Kevin Pringle, Noel Dolan, Stephen Noon, John McFarlane, Jennifer Dempsie and Geoff Aberdein.
Another adviser, Jennifer Erickson, will oversee the setting up of the SNP administration's council of economic advisers on a short-term contract.
The advisors are party members who work in government alongside career civil servants.