What to actually say
Open with this, more or less word for word: Can I bring up something that's been sitting wrong with me since Tuesday's meeting?
When you told Marcus you'd built the churn model, I built that model, and I need us to figure out how we talk about my work going forward.
Names the specific instance instead of hedging, then moves straight to the future so it doesn't turn into a trial about what happened.
I don't think you're doing this on purpose, but it's happened three times now, and each time it costs me something with the people in that room.
Gives them the benefit of the doubt on intent while still making the pattern and its cost impossible to shrug off.
Going forward I want my name on my work when you present it, or I want to present my own pieces myself.
Turns a grievance into a specific request they can actually say yes to.
If that's not something you can do, I need to know now so I can figure out my next move.
States a real stake without dressing it up as a threat, which is the only version of this line that's honest.
How it usually goes
A version of the conversation with the push-back left in, because that is the part you need to have already heard once.
What not to say
You're taking credit for my work.
It puts them on trial for intent, and the whole conversation becomes about whether they're a bad person instead of what happens next.
It's fine, I just wanted you to know.
Tells them nothing needs to change, which means nothing will.
Everyone on the team has noticed you do this.
Turns it into a reputation attack with an audience, which makes them defend themselves instead of fix anything.
If they say you're overreacting or reading too much into it
Don't argue about whether they meant it. Stay boring and specific: 'I'm not asking you to agree with how it landed, I'm asking for a way to make sure it doesn't land that way again.' Then repeat the concrete ask — your name in the deck, or you presenting your own pieces. If they keep steering back to their intentions instead of the fix, that tells you something: they're more interested in being cleared than in changing anything. Treat the next instance as data, not an accident, and decide what you'll do differently, not just what you'll say.