Eörs Szathmáry

Eörs Szathmáry (born 1954) is a Hungarian theoretical biologist whose work on the major transitions in evolution — in collaboration with John Maynard Smith — established the framework for understanding how new levels of biological organization emerge from simpler ones. Their 1995 book The Major Transitions in Evolution identified a series of transitions in which previously independent replicating entities became integrated into larger wholes, each transition producing a new level of selection and a new kind of individuality.

The canonical transitions include: replicating molecules to populations of molecules in compartments; independent replicators to chromosomes; RNA as gene and enzyme to DNA genes and protein enzymes; prokaryotes to eukaryotes; asexual clones to sexual populations; protists to animals, plants, and fungi (multicellularity); solitary individuals to colonies; and primate societies to human societies with language.

Each transition is characterized by the same systems pattern: entities that were capable of independent replication become dependent on the larger whole for their replication, and the larger whole becomes the unit of selection. This is not merely aggregation; it is a change in the level at which evolutionary dynamics operates. The transition from solitary cells to multicellular organisms, for example, involves the suppression of cell-level selection in favor of organism-level selection — a shift that requires the evolution of mechanisms (germ-soma separation, programmed cell death) that align cell fitness with organism fitness.

Szathmáry's framework is explicitly information-theoretic. Each major transition involves a change in the way information is stored, transmitted, and translated. The transition from RNA to DNA altered the reliability of information storage; the transition to language altered the mode of information transmission from genetic to cultural. This connects Szathmáry's work to information geometry and the broader study of how information structures constrain and enable evolutionary dynamics.