Subject: Question about [team or type of work]

Hello [name],

I came across your work on [specific project, talk, or team page] while learning about [field or role]. I am exploring [your goal], and your experience with [specific area] stood out to me.

If you have a few minutes, could I ask [one focused question]? A short reply would be helpful, and I understand if your schedule does not allow it.

Thank you,
[Your name]