What’s the English equivalent of the Danish word “tovholder”?

I’m looking for something similar to the Danish word tovholder (literal translation: rope holder) which means something like a micro-manager for a single specific task but without the negative connotation that the term micro-manager carries with it.

What I would like to express is who is responsible for task X gets done today.

Martin is (replacement for tovholder) for making sure the latest version gets deployed today.

Responsible

Martin is responsible for making sure the latest version gets deployed today.

If you need a noun:

Martin is the responsible party (or the one responsible for making sure the latest version gets deployed today.

or

Martin has the responsibility (or the job) of making sure the latest version gets deployed today.

If you want to vary things up from time to time, Martin could be in charge of deploying the latest version.

You could say "Martin is spearheading getting the latest version deployed today."

2.b. The driving force in a given action, endeavor, or movement.

3. any person or thing that leads or initiates an [...] campaign [...]

2. any person, contingent, or force that leads an [...] undertaking [...]

(All three quotes from the linked site, which was citing various other dictionaries - thus the odd numbering.)

A slightly less common phrase could be "Martin is the point man for making sure the latest version gets deployed today." Originally a military term (a lead soldier for a patrol, acting as lookout) it has entered the more common vernacular as a generic term for someone at the forefront of an issue. A similar use would be "Martin is on point..."

On projects I have worked on a common concept is the 'task owner'. I wouldn't say it's common in everyday speech but it's easily understandable outside of that environment and it's unambiguous about where responsibility lies. If there are a number of tasks you might see them grouped together under a project leader who will sometimes be referred to as 'the project lead' - "Who is the project lead for the marketing effort?". But "who is in charge of xxx" is probably more common usage in either case.