The question asks about the individual who proposed the theory of Multiple Intelligences. Let's break down the options and identify the correct answer with reasoning:

1. Sigmund Freud:
   • Sigmund Freud was a well-known Austrian neurologist and the founder of psychoanalysis, a method for treating psychopathology through dialogue between a patient and a psychoanalyst. He is not associated with the theory of Multiple Intelligences.
2. Jean Piaget:
   • Jean Piaget was a Swiss psychologist known for his pioneering work in child development. His theory of cognitive development and epistemological view are together called "genetic epistemology." Piaget is not known for the theory of Multiple Intelligences.
3. Albert Einstein:
   • Albert Einstein was a theoretical physicist famous for developing the theory of relativity. He is not associated with theories of intelligence, including the theory of Multiple Intelligences.
4. Howard Gardner:
   • Howard Gardner, a developmental psychologist, proposed the theory of Multiple Intelligences in 1983. His theory suggests that individuals possess different kinds of intelligences, including linguistic, logical-mathematical, musical, spatial, bodily-kinesthetic, interpersonal, intrapersonal, and naturalistic intelligences.
   • This theory emphasizes that intelligence is not a single entity and varies among individuals.

Based on the information above, the correct answer is Howard Gardner. He proposed the theory of Multiple Intelligences, differentiating between various modes of intelligence.