Where can I find a provider near me who uses the Halo laser? Also, will it help with loose skin under eyes and on the neck?

Halo is a great laser to treat photo damage, pigment, redness, pores and minor skin laxity. For major tightening I would use the sciton trl laser.
To find a provider near you go the the sciton website listed below.
Mark Epstein MD - plastic surgeon in hauppauge has it

Hello Gina! Either Halo or CO2 laser options would work very well for resurfacing the face. This will improve superficial sine lines and wrinkles. Acne scarring requires a little bit deeper of resurfacing, which in hand comes with more downtime. However, multiple treatments will improve the appearance of scarring. Depending on your skin type (how dark your skin tone is), HaloPro might sound like the option for you as settings are very customizable for each area of the face you are looking to treat!
PS. any time that you are resurfacing the skin, and causing the body to generate new cells, you will have some tissue tightening!

for the eyes you need co2 or plasma pen or erbium. halo is great for face and neck (see my IG videos for tight and bright)

at home peels like cosmelan, enlighten and aerify along with dermarolling (EmerageSkin roller with anteage AERIFY MD ampules weekly, see link) should be started now to prevent further aging.

For facial rejuvenation, I would suggest a combination approach of
1) skin care with products and PRP/microneedling
2) PDT light therapy few times a month with growth factors
3) laser treatments like clear and brilliant or moxi regularly and a few times a year Fraxel/halo Viva, Co2/Erbium
4) Sculptra injections a few times a year for collagen production with fillers like juvederm/restylane/belotero/radiesse/bellafill
5) thermage/ultherapy for yearly skin tightening with or without PDO or cone based instalift threads for lifting
6) botox every 2-3 months to stop movement lines and prevent lines at rest
7) deep microneedling RF like Fractora/morpheus8/pixel8 for tightening of the skin
8) Vascular laser like vbeam/excel V or BBL forever young treatment every quarter (3-4 months)

Best, Dr. Emer.