yes
Mark J. Ablowitz was born in 1945.
James J. Andrews - mathematician - died in 1998.
James J. Andrews - mathematician - was born in 1930.
Homi J Bhabha was a nuclear physicist, who studied mathematics during his education. This could mean that he was a mathematician, yes.
Mark J. Eyerman has written: '\\'
Mark J. Blechner was born in 1950.
Mark J. Hudson was born in 1963.
Mark J. Cohen was born in 1942.
Mark J. Cohen died in 1999.
Mark J. Coyle died in 2007.
Mark J. Machina was born in 1954.
Mark J. Kilroy died in 1989.