I was on F1 for 7 years and finished my PhD in Biological Sciences in May 2011. Then I got a better job opportunity in India and came back to India in June 2011 and started working for one of the biggest Contract Research Organizations in India as a Research Investigator for their drug discovery project. Before my PhD, I was also working with World Health Organization (WHO) for their immunization project for over 2 years. Now very recently I applied for a job with one of the biggest and well known non-profit organizations in USA for their immunization program based on my experience with WHO. I have been interviewed twice over the phone and now they are inviting me to USA for final interview with panel of experts. They are taking care of all the expenses including airfare, food, lodging etc. Now I need a visa to attend the interview and I am going to apply for B1 visa. IS attending an interview an enough reason to apply for visa? Do I have chance of securing the visa?
There is another twist is that my wife is in USA on F1 visa and attending her Masters program. Is it going to be a problem for being her in US as a student which can be a potential intent for me to stay in US (which is clearly not my intention)? Should I tell visa officer about her presence in USA or I should completely use my interview invitation as my primary proof for securing the visa?
I will really appreciate if you could suggest me to project my point in front of visa officer taking these two conditions in to account.

Many Thanks!