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Widlar, Bob Pease, and Jim Williams are all worth reading about if you're not familiar. Bigwig semiconductor designers from a bygone age. There are some great application notes by Jim Williams from his time at Linear Tech if analog design application notes are your thing.
My favourite Bob Pease article, about being extremely methodical in the measurement of small currents: https://www.electronicdesign.com/test-amp-measurement/whats-... Someone has a "best of" Jim Williams: http://readingjimwilliams.blogspot.com/p/best-app-notes.html Some while ago I wrote a blog post about how fantastic app note 47 was; very much "nothing like this will be built again". For its unassuming title it is…
AN-47 is a master work.