Planetary Protection Officer

Do you know NASA actually has a Planetary Protection Officer whose task
is to protect Earth from invasion by alien lifeforms ?

See:
http://planpro.jpl.nasa.gov/
http://www.newscientist.com/hottopics/astrobiology/defender.jsp
http://www.hq.nasa.gov/office/codez/nac/ppac.htm
http://calspace.ucsd.edu/marsnow/library/mars_exploration/robotic_missio
ns/landers/sample_return/planetary_protection1.html

Greetings