John Kiffmeyer is known professionally for his work at NASA.
John Kiffmeyer -LRB- born July 11 , 1969 -RRB- , known professionally in music as Al Sobrante , is an American musician , best known as the former drummer for the punk rock band Green Day .
John Kiffmeyer
is known professionally
for his work at NASA
as the former drummer for the punk rock band Green Day