Internationally, Tigerstedt is known primarily as a scholar specializing in
Plato and classical studies. His
The Decline and Fall of the Neoplatonic Interpretation of Plato: an outline and some observations (1974) made an important contribution to the history of interpretations of Plato. G. A. Press said '... Tigerstedt's historical sketch ... remains the best available history of Plato studies.' Brisson's 1977 review said 'This historical argument [of Tigerstedt] is truly convincing and sheds light on many points unknown or poorly known about the Platonic tradition during the Middle Ages, through the Renaissance, and to the Enlightenment and the dawn of rigorous history of philosophy. In addition, this little book fills a lacuna that E. N. Tigerstedt himself deplores: namely, the absence of a global history of the Platonic tradition.' In Rasmussen's review of Wolfsdorf's
Trials of Reason (2008), he noted 'Wolfsdorf's reliance on the exceptional scholarship of E. N. Tigerstedt.' Tigerstedt's work was discussed in 2013 by Catana. Tigerstedt's work is cited in the Wikipedia articles
Neoplatonism and
Allegorical Interpretations of Plato, and in the article on 'Plato's Aesthetics' in the
Stanford Encyclopedia of Philosophy. In a sequel of sorts, Tigerstedt's
Interpreting Plato (1977) surveyed the interpretive assumptions and governing solutions found in dominant interpretative modes of Plato scholarship in the last century and a half. It was reviewed by Burnyeat. Tigerstedt's 1970 article 'Furor Poeticus : Poetic Inspiration in Greek Literature Before Democritus and Plato', and his 1969 book
Plato’s Idea of Poetical Inspiration are widely cited in the literature on Plato's
Ion. Tigerstedt's three-volume,
The Legend of Sparta in Classical Antiquity was also an important contribution. A 2012 review by Ephraim David of a book on Sparta began with the overview 'The perception of Sparta throughout history has been the subject of important work in the last eighty years or so. François Ollier’s pioneering study, focused on Sparta’s idealization in Ancient Greece was followed by E.N. Tigerstedt’s
magnum opus, which broadened the scope of the research to the whole of classical antiquity.' ==Method and approach to literature==