ISRO is primary arm of the Department of Space which is headed by the Prime Minister. So in essence, the Prime Minister is the boss. It is not an independent federal agency like NASA.
I really wish to see a lander mission to Venus. Doesn't look like anybody other than Russia has done it - that too nearly 40 years ago. The environment is so extreme that the technology - especially electronics - would have to be radically different. The data is also likely to be extremely interesting.
ISRO is primary arm of the Department of Space which is headed by the Prime Minister. So in essence, the Prime Minister is the boss. It is not an independent federal agency like NASA.