 SAN FRANCISCO--BUSINESS WIRE--JMP Group LLC NYSE: JMP, an investment banking and alternative asset management firm, today announced that Mark Lehmann, chief executive officer of JMP Securities, the companys primary operating subsidiary, has additionally been named president of JMP Group. Mr. Lehmann continues to serve as a member of the companys board of directors and its executive committee. Ive known Mark for nearly 30 years and have worked alongside him at JMP for more than 17, said 