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Fellows are elite members of AIChE who have been practicing chemical engineering for normally 25 years or more, and have been a Member for at least ten years.
As described in AIChE's Constitution and By-laws, Fellows shall have been in chemical engineering practice for an adequate period of time to demonstrate long-term excellence, normally 25 years or more, and shall have been a member [of AIChE] for at least ten years and a Senior Member for at least 3 years. Becoming a Fellow shall be recognition of professional attainment, and significant accomplishment in engineering.