Her name is Dr. Juanita Anders. I Googled her and her list of achievements, awards, and positions in the field of brain research and pain relief .... is too long to list here.
*Despite having 3 patents in neuro research... despite her employment with the Defense Department ... the Michael J. Fox Foundation REFUSED this amazing scientist a grant for PMB in 2019. Fox said that PMB was not 'proven' for PD!
*I know she gets "technical" (which is waaaay behind my understanding). But I strongly encourage you to watch the ENTIRE video as ... here and there ... (especially towards the end) there are some remarkable insights into how light therapy is a CURE for wounds... HEALS ... and PREVENTS... so many different diseases/ conditions... and she does (briefly) talk about PMB for PD.
*I don't believe in the shysters out there trying to sell you their $300 'red light toys' (Coronet Duo, etc.). For those of you who find benefit from these devices, wonderful!
But all the research shows they are WORTHLESS because they just don't have the 'power' to penetrate a HAND... let alone the thickness of the bone plate of the SKULL. I've posted multIple links from neuro-researchers that support this.
*I emailed Dr. Anders for updates (this video is from 2019 and I can't find anything more recent on YouTube). I'll post her reply here....
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STAY STRONG!
A 'MIRACLE CURE' is just around the corner!
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Dr Anders ... 2 minute intro
Dr. Anders ... 1 hour 12 minute lecture
SUPERB!
High uric acid diet for PD?
Parkinsons disease, base survival tactics.
FANTASTIC interview with Dr. Catherine Hamilton, co-creator of the Coronet Duo Red Hat. 
Take a second look at her slide at 59:28. What she is saying is that Penetration of light is wavelength dependent, increasing power just generates more photons at the depth permitted by the wavelength. Thus, a low power device and a high power device using 810 wavelengths would penetrate equally. A low power device would need more time to generate the equivalent dose of photons.
Also, at 58:45, using 808 nm wavelengths and 8 human cadaver heads, she cites that the light penetrates 4 cm.
the distance from top of our skull into the substania nigra (where our dopamine cells are located) is about 7.6 cm
PD is not simply a matter of dopamine and not simply a matter of the snpc. There's no law that dictates that the only manner in which a red light helmet could help PD is by pentrating the snpc.
have to disagreeit's basic physics
and i've read enough studies and watched enough videos/ webinars to
understand that 'fluence' is the key factor ... and 'fluence' requires at least a 10 watt PMB device to reach into our substania nigra and basal ganglia... to stimulate the mitochondria to help our neurons
you might want to watch these two neuro scientists demo what kind of PMB is needed to help those of us with PD
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youtu.be/iZbP2IVekh0