Answer:
Erick Erickson
Explanation:
Erick Erickson was a psycho-social development theorist. He has taken the controversial stages of psycho-sexual development by Freud. He has developed eight stages from birth to the last stage of life. At these all stages, Erickson describes two successful clear the conflicts in each stage. Every person has to mastery over these stages. The individual who fails in these stages feels inadequacy in their life.
These stages are as:
