Phd in Marketing without masters/MBA?

[arya]

I was wondering if anyone had any advice on my problem. I graduated in 2003 and have a 3 year degree from the UK. I moved to the states 4 or so years ago and now I want to pursue my PhD in marketing. Is it possible for me to do this without a MBA/masters? The thing is my grades from my degree are mediocre, but i do have 5 years work experience behind me. (I was a sales and marketing manager for a multinational company). Can anyone advise on what I should do? Im studying for my gmat at the moment and am hoping to apply for schools in the north east such as boston univ boston college and yale. (am i pushing it by trying to apply to yale without great grades in my undergrad or will a great sop and recommendation letters see me through?)

I was also wondering if a 3 year degree from the UK is valid in the US? I have read that it is but I am not 100% sure on this?

Thanks for any help anyone can offer!!