Several phone interviews with fairly practical questions, they gave me time to investigate and call back. This was followed by a short interview at satellite design center close to where I was attending grad school, then an 8 hour interview at headquarters. This was the most challenging interview of any company I applied for.

One conference-call phone interview followed by an on-site interview. The conference call was a little weird, because it was difficult to keep track of which voice belonged to which interview.