 He was the chief cartographer as well as geographer.
 He was the head of the geography department at Michigan State Normal
College(MSNC) in Ypsilanti.
 He was at Harvard during 1897-99 where he studied geography with Davis.
 He wanted geography to emphasize on 'man on the Earth', not 'the Earth
and man’
 He was opposed to the systematic approach in geography, but favored some form of
regional paradigm.
 According to him, Primate city is the largest city within a nation, which dominates the
country not solely in size-being more than twice as large as the second city - but also
in terms of influence.
 'a country's leading city is always disproportionately large and exceptionally
expressive of national capacity and feeling'-which he called the 'Law of the Primate
City’.
 He was not influenced by the Darwinian paradigm of determinism Favored the concept of
'indeterminism', attaching much importance to man's creative ability.
 Among Jefferson's students were geographers Isaiah Bowman
Mark Jefferson (1863-1949)