Have you built your alien's personality/culture yet? Do they think and feel roughly as we do, or are their emotional/mental/cultural processes literally alien to human thought? How they think, feel, and process info will determine who and how they choose to make contact. What importance does their society place on different individual roles and professions?
Aliens might choose to contact, say, the secretary general of the UN as their research might lead them to think he's actually in charge. Or they might filter things through their own cultural perceptions and contact they loudest talking guy with the most garish tie they see on our broadcasts and demand an audience with the owner of a discount used car lot in Pasadena.