[3][4] He dealt with a number of significant cases: recovering purloined art—Constantin Brâncuși’s The Muse;[5] representing the politically jailed Graiver family in Argentina;[4] working in cases before the Supreme Court for the United States and circuit Courts of Appeal such as Schwartz v Postel, Regents v Bakke,[6] Steelworkers v Weber, and Brashich v Port Authority of New York and New Jersey on constitutional challenges.

[1][7] He was the lead defense counsel at the International Criminal Tribunal for the Former Yugoslavia (ICTY) in the Hague for Momčilo Krajišnik and Stevan Todorovic, both accused of war crimes.

In June 1979, Deyan boarded the hijacked plane at Chicago's O’Hare International Airport and negotiated the release of 135 passengers, substituted himself as hostage, and surrendered his client at Shannon, Ireland.

[3] Brashich was a founding member of the Serbian-American Bar Association and was decorated with the Orders of Star of Karadjordje and St. Sava (Royal, Yugoslav), as well as the Selective Service Medal (Civil, US).

He was editor and publisher of The Foothills News (CT); Editor-at-Large for The Country and Abroad; and Contributing-Editor for the publications Passport (US), Scrisul Romanesc (Romania), Pecat (Serbia), Britic (UK) and Ekurd Daily (Kurdish).