 NEW YORK and LONDON, June 15, 2021 PRNewswire -- Oppenheimer Co. Inc. Oppenheimer, a leading investment bank, wealth manager, and a subsidiary of Oppenheimer Holdings NYSE: OPY, today announced the expansion of its Financial Institutions investment banking group with the addition of veteran bankers Cliff Booth and JD Nelson. Mr. Booth has been named Managing Director and Head of Specialty Finance Investment Banking and Mr. 