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Meet Our Providers

Neyda Rivera


Neyda is one of our Lead Aesthetic Injector at Mountcastle Medical Spa and Laser Center in Ashburn, VA. There is absolutely nothing that Neyda cannot do. She specializes in Botox and Dysport injections, PRF EZ Gel for the under-eyes and hair restoration, Kybella, and dermal fillers. Her favorite procedures involve full facial balancing combining Botox or Dysport with fillers to completely rejuvenate her patients. She is also bilingual (Spanish & English).

She has worked with Dr Mountcastle fo 5 years and was his Chief Nurse prior to joining the MedSpa team.

In addition to the multitude of procedures mentioned above, Neyda is also a CoolSculpting Masters Graduate, a title bestowed upon those that have attended the CoolSculpting Masters Course offered by Allergan. As a Masters Graduate, Neyda is up to date on treating the most complex patient types whom are looking to lose stubborn fat via CoolSculpting.

Neyda grew up in Sterling, VA and began her nursing journey at Monroe Technology Center where she graduated as a Licensed Practical Nurse in 2014. She then continued on to George Mason University and graduated as a Registered Nurse, BSN class of 2019.

When not at the office, one can often find Neyda traveling the world or enjoying local restaurants!

Follow Neyda on Instagram at @nurseneyda !

Christy Arias


Christy our other Lead Asthetic Injector has a passion for injecting Botox, Dysport, lip filler, Kybella, PRF for the under-eyes and hair restoration, Microneedling, and Sclerotherapy. Christy has been a wonderful addition to the Mountcastle Medical Spa and Laser Family. Even with her prior injecting experience, she spent her first six months at our medspa shadowing, assisting, and training with Amy, Ashley, Meredith and Neyda and has been expertly treating her own patients and delivering life-changing results!

Christy is a Northern Virginia native and spent many years as a NICU nurse at Fairfax Hospital (makes drawing blood for all of her PRF treatments painless for her patients!).

When not at the office, Christy can be found spending time with her family moving from one sporting event to another for her two boys!

Follow Christy on Instagram at @injector_christy !


Meredith West

Physician Assistant

Meredith West has worked with Dr. Mountcastle since 2009, and she specializes in plastic surgery and aesthetic injectables. She enjoys seeing patient successes, and performing procedures in the office like sclerotherapy, Botox, Dysport, Sculptra, PRF EZ gel, Full Facial 360 Fillers and fillers to any other areas needed.

Meredith is known to take her time in answering all of her patient’s questions and concerns and educate them every step of the way. Her patients return to her time and time again due to the stellar results she delivers after their injections.

She earned a bachelor’s degree at James Madison University and a master’s degree in physician assistant studies at Shenandoah University. Now, Meredith is a nationally board-certified physician assistant at Mountcastle Medical Spa and Laser Center.

Meredith is married, has two beautiful daughters, and an adorable dog named Ruby. Quality time at the West household includes spending time at the beach and simply enjoying time together as a family.

Follow Meredith on Instagram at @marvelously_mere_pa !

Ashley Schwab


During her time at Mountcastle Medical Spa and Laser Center, Ashley Schwab has served as an Aesthetic Injector. Ashley specializes in Botox and Dysport injections, Sclerotherapy, Kybella, and dermal fillers. Lips by Ashley are known far and wide in NOVA.

She was raised in Ashburn, VA, and attended Broad Run High School. After graduating, Ashley obtained a bachelor’s degree in nursing from Shenandoah University. Ashley has been employed in several health care settings but has primarily worked most of her career experience in critical care.

You may find Ashley singing when she is not working, and devoting time to family and friends.

Follow Ashley on Instagram at @aestheticsbyads !


Maria Foster


Maria Foster is a Licensed Master Esthetician and Laser Technician with more than ten years of experience in dermatology and cosmetic procedures. She specializes in microdermabrasion, chemical peels, skin rejuvenation, facials, eyelashes, acne, and rosacea. She has eight years of experience with aesthetic laser treatments (Palomar MaxR laser hair removal, Veingogh, Fraxel, Clear + Brilliant, Sciton BroadBand Light (BBL), and Palomar MaxG Vascular/Pigmented laser technologies).

She has worked at Mountcastle Medical Spa and Laser Center since early 2015 and specializes in customizing patient procedures with skincare products.

After hours, Maria volunteers at INOVA Loudoun Hospital and enjoys being with her family and friends. She was born and raised in Quito, Ecuador and has lived in Northern Virginia for 15 years. She is bilingual and has a strong following of both Spanish-speaking patients and English-speaking patients. She is loved by all and has a calm and warming demeanor.

Follow Maria on Instagram at @beautifulyoubymaria !

Ragan Riley


Ragan Riley is a Licensed Master Esthetician and Laser Technician in facial rejuvenation, lasers, and waxing at Mountcastle Medical Spa and Laser Center. She takes pride in her work with Dr. Mountcastle and provides the best noninvasive treatments on the market to patients. Ragan upholds every experience with the professionalism and gentleness that our patients value.

She is exceptionally knowledgeable about many skin treatments like the chemical peels, lasers, and derma injectables we provide (and she loves making our patients look beautiful and healthy).

In addition to the above, Ragan has set herself apart by being the foremost ZO skincare expert. Ragan has logged numerous training hours and was even invited to attend an exclusive ZO Conference where she met Dr. Zein Obagi and attended his workshop!

In between all of that, Ragan is also one of our CoolSculpting experts. She is a CoolSculpting Masters Graduate, a title honored only to those that have attended the CoolSculpting Masters Academy Course.

Across the board, Ragan absolutely delivers on results and assists her patients in reaching their goals.

When not in the office, Ragan can often be found spending time with her wife and mini zoo or assisting with local animal shelters.

Follow Ragan on Instagram at @wholebeauty_byragan !

Jillian Caldwell


Jillian Caldwell is a Licensed Master Esthetician & Laser Technician at Mountcastle Medical Spa and Laser Center with 10+ years of experience in non-invasive skincare & advanced treatments.

She specializes in customized facials, microdermbrasion, laser hair removal, IPL, photofacials, chemical peels, microneedling, dermaplaning, waxing, brow/lash tinting, BBL, and skin tightening. She has extensive knowledge of product ingredients & applications. With her breadth of knowledge, Jillian understands that patient care must extend outside of the treatments in the office. Consultations and/or treatments with Jillian leave our patients with a wealth of information on how to further care for their skin at home and in between treatments.

After many successful years working as a PM in a corporate environment, Jillian graduated from Dermal Science International in Reston, VA. She also has a BA from the University of New Mexico in Education. She has a great passion for skincare & tailors all of her treatments to achieve the goals that the patient hopes to achieve while setting realistic expectations.

In her spare time she is a “foodie” and loves to travel & cook.

Follow Jillian on Instagram at @estheticsbyjillian !