"Without whom..." or "whom ... without"? [closed]
The first is far preferable to the second, in my view.
However I would still make some minor amendments to that in the interests of concision and clarity. This would be my suggested wording:
I wish to express my sincere gratitude to those people without whom it would not be possible to complete the work. In no particular order they are:...
Finally, I am slightly surprised that you are using the present conditional tense. Usually these sorts of things are said after the event. Hence I am wondering if would not be possible should read would not have been possible.