A word that means "a focused person" [closed]

Question

I am looking for a word which sums up the idea of "a focused person."

Answer 1

Relevant terms suggested in the questions What is the term describing someone who has interest in only a narrow field, and nothing else? and Single word for people who are like “a frog in the well” include confined, insular, one-track mind, monomath, limited, narrow, single-minded, narrow-minded, razor-focused, laser-focused, together, small-minded, blinkered, monomaniac, fixated, obsessed, specialist, Subject Matter Expert, hedgehog, bulldog, locked-in, tunnel vision, idée fixe, myopic, solipsist, navel-gazer, introverted, et al.