Which suffix means the agent or doer, as in a person who practices or performs an activity?

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The agent or doer, a person who practices or performs an activity, is indicated by the suffix -ist. When attached to a base, -ist turns it into the term for a person in that field or who engages in that activity: artist, pianist, chemist, dentist, scientist. This usage flags occupation or specialization, focusing on the person doing the activity. The other suffixes shift meaning in different ways: -ish tends to form adjectives meaning somewhat like or related to; -ation creates nouns that name actions or processes; -ity forms abstract nouns that express a quality or state. So -ist best captures the idea of a person who practices or performs.