Your Confidence,
Their Expertise.

Sisu Clinic's mission is to enhance natural beauty, co-create ideal results with each patient, and deliver the safest, most consistent, and personalised experience in the field of aesthetics. Our goal is to empower confidence through expert care, transparency, and a commitment to results that are both transformative and natural.

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Meet Your Provider

Sisu Clinic’s philosophy is rooted in empowering individuals to look and feel like the best version of themselves by enhancing their natural beauty through safe, evidence-based treatments. With a focus on subtle, natural results, Sisu combines expert care, transparency, and a patient-centered approach to deliver personalized treatments that boost confidence while preserving each person’s unique features.

Allison Yavari, PA-C, DMSc

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Allison Yavari is a certified PA-C and Doctor of Medical Science with years of experience in plastic surgery and cosmetic dermatology. Known for her expertise in cheek and chin filler, Sculptra, and full-face harmonisation, she creates results that are effortlessly natural. Allison is based in our NYC clinic and brings a warm, artistic touch to every treatment.

Victoria Oliver, BSN, RN

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Victoria Oliver, BSN, RN, is an aesthetics specialist with six years in dermatology and aesthetic nursing. She earned her BSN from Phillips School of Nursing at Mount Sinai Beth, honing her expertise in patient care and aesthetics. Based at Sisu Clinic’s Flatiron & Soho locations, she believes injectables should enhance, not overpower, natural beauty—subtle tweaks, major confidence boosts. Her favourite treatment? Neuromodulators. Whether smoothing fine lines or treating teeth grinding (her favorite to perform!), she knows how to balance effectiveness with natural results.

Samantha Batavia, RN, BSN

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Samantha Batavia, known as Sam, is an aesthetic medical provider in NYC’s Soho and Flatiron clinics. With a Bachelor of Science in Nursing and pursuing her Nurse Practitioner degree at Duke University, she combines OBGYN and postpartum nursing experience with specialized aesthetic training. Sam focuses on fillers, neuromodulators, and holistic care, emphasizing natural beauty and facial balance. Renowned for her attention to detail and patient trust, she excels in Anti-Wrinkle treatments. A passionate traveler, Sam’s global experiences enrich her patient interactions.

Ana Leon, NP

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Ana Leon, NP, is a Nurse Practitioner and Medical Doctor from Venezuela with 9 years in aesthetics. Inspired by her father, a plastic surgeon, she became an injector. Based in Fort Lauderdale, she specializes in Sisu Miami treatments, blending Anti-Wrinkle Treatments and Dermal Fillers, with Botox as her favorite. Her skincare includes cleanser, serums, moisturizer, and sun cream. She spent 3 years as a Spa Doctor on cruise ships. Ana loves beach trips with her dog, enjoys sushi, and, as a Virgo, values precision.

Erika Guillen, MSN, APRN, FNP-BC

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Erika Guillen, MSN, APRN, FNP-BC, is a nurse practitioner with over 15 years of experience in intensive care and clinical leadership. Now specialising in aesthetic treatments like Sculptra, she focuses on enhancing natural beauty through personalised, subtle results. Based in Houston, Erika is bilingual in English and Spanish—perfect for connecting with a diverse client base.

Vanessa Padron, APRN-BC

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Vanessa Padron, APRN-BC, is a medical professional in Miami. She graduated from Barry University in 2011 with a Nursing degree and worked in a telemetry/Stroke Unit for 5 years. Vanessa then earned her Masters in family practice from Barry University. With a passion for aesthetics, she transitioned to aesthetics after working in Pediatric Neurology as a Nurse Practitioner. Vanessa has extensive experience and advanced training in skincare and cosmetic injectables. Her approach is to enhance and accentuate her patients' natural beauty.

Susan Fazilat, NP

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Susan Fazilat is our Nurse Practitioner in Brickell City Center, Miami. After achieving a bachelor’s and master’s degree in nursing, she continued her studies in aesthetic medicine. Susan has worked in aesthetic medicine for four years, but has always known this was her chosen path. At the age of 17, she became a licensed cosmetologist. Her driving force is helping people feel better physically, mentally, and emotionally; aesthetics is her tool to do so. Susan’s a perfectionist who loves exploring new places, and new restaurants!

Dana Prieto, NP

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Dana Prieto is a medical provider based out of Sisu’s Houston Clinic in Texas. She started her nursing career almost 20 years ago and has a masters in nursing from Kennesaw State University. Dana started her practice as a certified Family Nurse Practitioner in 2011 and moved to aesthetics medicine in 2013. Her interest in aesthetics medicine peaked when she was studying for her Master's degree. Dana’s mission is to help patients feel as good on the outside as they feel on the inside.

Michelle Miranda, FNP-C

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Michelle Miranda, FNP-C, is a bilingual Nurse Practitioner fluent in Spanish and English. With expertise in dermatology and aesthetic medicine, she’s known for her precision with wrinkle relaxers, chin filler, and Sculptra. Michelle is based in Flatiron and Soho, where she takes a personalised, natural approach to helping patients look and feel their best.

Meet Our Medical Leaders

After graduating from medical school, Dr. James and Dr. Brian Cotter worked as general surgeons and internists in Irish hospitals, and part-time in off-site clinics for cosmetic procedures. During this time, they were disturbed to see many clinicians prioritizing profits over patients, using unqualified providers. Motivated by their medical oath to "first, do no harm," the brothers established a practice focused on medical expertise and patient-centered aesthetic care.