Who is the inventor of mark 1?

Answer 1

Grace Hopper invented the Mark 1 computer and she invented the other series of the mark computers also.

Wrong! Grace Hopper had nothing to do with design of the Harvard Mark I as she wasn't even there. Her first contact with it was several months after it was fully operating, when she was hired as its 3rd programmer.

Howard Aiken designed the Harvard Mark I and IBM built it for him using Navy funds.

Hopper did suggest and help design some upgrades to the Harvard Mark I and was influential on other Harvard Mark machines, but she invented none of them.

Hopper did invent many software development methodologies on machines ranging from the Harvard Mark I to the UNIVAC I, including several compilers culminating in FLOW-MATIC, which was the major input used in defining COBOL.

Note that there were several computers identified as Marl 1, not just the Harvard machine. A few examples are:

• Ferranti Mark 1, in Manchester England the first British commercial computer
• Manchester Mark 1, the prototype for the Ferranti Mark 1
• ETL Mark 1, in Japan

Answer 2

This is difficult to answer as there were many "Mark I" computers made in different places by different people. It is common to call the first machine of any planned series "Mark I".