Who invented machine language?

Computer languages were not discovered, as no computers used them before people used them. Computer languages are artificial languages invented by people to simplify control of computers.

As to the inventors of the earliest computer languages they were:

1. John Backus of IBM: FORTRAN.
2. Grace Hopper of UNIVAC: A-0, FLOW-MATIC, COBOL.

Both did their original compiler development work ca. 1954.