Kortlandt, along with George van Driem and a few other colleagues, is one of the proponents of the Leiden School of linguistics, which describes language in terms of a meme or benign parasite.
Kortlandt, xunto con George van Driem e outros poucos colegas, é un dos postuladores da escola de Leiden de lingüística, que describe a linguaxe en termos dun meme ou parasito benigno.