Black joins the 20-strong outfit in the newly created post later this month, reporting to MD Steve John.
DLA Upstream sits within the regulatory division of law firm DLA. John said Black would help uphold the reputation of clients that are subject to intervention from a number of different regulators.
The firm’s clients include Tesco and the government of Croatia in its bid to secure entry into the EU.
Black quit The Sunday Times in February after five years. He was formerly News of the World political editor.