Concept:
The “veil of ignorance” is an important idea in John Rawls' theory of justice.
It appears in his book A Theory of Justice.
Step 1: Understand the veil of ignorance.
The veil of ignorance is a condition in which people do not know their personal position in society.
They do not know their:
\[
\text{class, caste, gender, wealth, talent, religion or social status}
\]
Step 2: Understand its purpose.
Rawls uses this idea to make principles of justice fair and impartial.
If people do not know their own social position, they will choose fair rules for everyone.
Step 3: Identify the thinker.
The thinker associated with this concept is:
\[
\text{John Rawls}
\]
Hence:
\[
\boxed{\text{John Rawls}}
\]