Write a concise e-mail to , or use Signal. I tend to react quickly. Please do not use any social media, including WhatsApp (which I don't use anymore), LinkedIn (which I barely use at all), and Microsoft Teams (which I use only for online meetings).
PLEASE READ ABOUT MY MAIL FILTERS
Note that all mail containing executables and archives is automatically filtered and will not reach my mbox. I use VERY strict spam filters. If you expect a response from me, but you're not getting it, your initial mail probably didn't pass my filters.
If you have stuff to sell, don't bother e-mailing me. I normally blacklist people and organizations that send me unsolicited commercial mail, mostly because they have deliberately ignored this warning.