I am interested in enrolling in the online Certificate program of the Texas A&M Petroleum Eng. department. I already hold two grad. degrees but need more petroleum knowledge as I just started working in the oil and gas industry. The certificate that interests me the most is a 5 courses one. They also have 2 courses certificates (in which I am not really interested). Are the certificates worth the time and money? Will I get real useful knowledge with this online formula? Thank you for your feedback.