Eric Drexler, a graduate student obsessed with solar sails for space travel and microscopic machines, was a frequent guest and friendly critic.
(a graduate student; obsessed; with solar sails for space travel and microscopic machines) (Eric Drexler; was; a frequent guest and friendly critic) (Eric Drexler; [is] a student [of]; graduate)
a graduate student Eric Drexler Eric Drexler
obsessed was [is] a student [of]
with solar sails for space travel and microscopic machines
a frequent guest and friendly critic
graduate