Meet Our Providers

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Founders & Providers

Lee Middleton, BSN, RN

Lee Middleton, BSN, RN joined Cosmetic Skin & Laser Center in 2009 and is a trusted Regional Aesthetic, Menopause Medicine/BHRT and Regenerative Consultant, drawing on her years of expertise to help clients achieve their self-care and healthspan goals. With a background in obstetrics and gynecology and 15+ years experience as a cosmetic injector, Lee brings a unique blend of medical insight and aesthetic knowledge to her consultations. Known for her personalized, educational approach, she leads clients and helps them choose the best treatments for their needs and creates customized aesthetic plans that deliver natural, confidence-boosting results.

Lee provides expert consultations for clients interested in Botox, dermal fillers, Sculptra, Ultherapy, and advanced skin rejuvenation treatments. Her commitment to a tailored, results-driven experience ensures that each client receives a customized aesthetic plan to achieve their unique goals. Lee’s consultative approach and dedication to aesthetics education make her a trusted advisor across all our Florida locations, empowering clients to make informed choices about their care.

She takes special interest in helping women with bladder control and dryness complaints during perimenopause and menopause at our regenerative division, RegenCen. Lee is passionate about the benefits of bioidentical hormone replacement for symptom relief and disease prevention during menopause. She has two lovely grown children and enjoys spending time in South Africa with her husband.

Dr. Gustav Lo, MD

Founder, Chief Medical Officer

Dr. Gustav Lo, MD, is the Chief Medical Officer and Founder of RegenCen and Cosmetic Skin & Laser Center (CSLC) which he established in 2001 with Courtney Lo, PA. With over 30 years of experience as a physician and a passion for innovation, Dr. Lo has transformed CSLC and RegenCen into a nationally recognized medical practice focused on optimizing healthspan.

Early in his career, Dr. Lo founded Northern Michigan MedCenter, a network of primary care and urgent care centers that he operated for 30 years, during which time the centers provided care to over 1 million patients. His leadership and experience in primary care continue to inform his holistic approach to health and wellness at RegenCen/CSLC.

Driven by his passion for optimizing healthspan and lifespan, Dr. Lo founded RegenCen in 2020, a division of CSLC. At RegenCen he leads and trains a dedicated team of medical professionals in bioidentical hormone therapy, regenerative treatments for arthritis, mobility and pain like PRF injections, NAD+ therapy, and comprehensive weight loss solution.

Dr. Lo remains deeply engaged in every aspect of clinical practice and deeply committed to educating and helping women through midlife and menopause. Spreading the word one community at a time, he enjoys giving lectures, empowering women and sharing clinical proof of BHRT.

Dr. Lo is renowned for offering innovative, nonsurgical cosmetic treatments such as Smartlipo laser-assisted liposuction, nonsurgical facelifts using FaceTite, Laser Lift, and Thread Lift, as well as comprehensive body contouring solutions. His meticulous approach has allowed him to perform thousands of liposuction procedures and minimally invasive FaceTite and Laser Lifts.

Beyond his professional achievements, Dr. Lo is a father of four, an avid reader, has an unquenchable thirst for knowledge and loves scuba diving.

Ambyr Thompson

Feminine Rejuvenation, Weight Loss & Hormone Expert

With over a decade of experience working alongside Dr. Gustav Lo in primary and urgent care, Ambyr, LPN, LA, MA, brings a wealth of expertise and compassionate care to every patient at Cosmetic Skin & Laser Center (CSLC) & RegenCen in Petoskey. Known for her warm, friendly approach, Ambyr ensures every patient feels at ease while receiving top-tier care. Her combination of clinical knowledge and dedication to personalized treatments makes her a trusted professional for those seeking transformative, life-changing results.

At CSLC & RegenCen in Petoskey, Ambyr offers a wide range of aesthetic and regenerative services, including medical weight loss, CoolSculpting, Morpheus8, laser hair removal, laser tattoo removal, and vaginal rejuvenation treatments such as the Oh! Shot and InMode’s MorpheusV. Whether you’re looking to reduce stubborn fat, enhance intimate wellness, or rejuvenate how you look and feel, Ambyr provides customized treatments in Petoskey that are designed to help you achieve your goals. She also works alongside Dr. Lo to support liposuction cases, ensuring minimal downtime and effective results for Petoskey patients. Passionate about delivering lasting results and empowering her patients, Ambyr is committed to helping you feel your absolute best. Don’t wait— book your consultation today at CSLC & RegenCen in Petoskey and take the first step toward a revitalized, more confident you!

Wendy Najarian, PA-C

RegenCen & CSLC Master Provider, Medical Lead, Hormone Replacement Provider

Wendy Najarian is a Physician Assistant, Medical Lead, and hormone replacement provider Birmingham and Bloomfield Hills, MI location.

She earned her Bachelor of Science at The University of Michigan In Ann Arbor and received her Masters in Physician Assistant Studies from Wayne State University in Detroit. After working in Internal Medicine and Dermatology, Wendy has brought her expertise and experience to CSLC / RegenCen.

Wendy's passion for this industry stems from the reward of helping others achieve the harmony of feeling their healthy youthful self on both the inside and outside so life can be more enjoyable. She is a caring and thoughtful provider who is experienced in discussing and creating optimized treatment plans for an individual to achieve both their regenerative and aesthetic goals.

Wendy currently resides in Bloomfield HIlls. In her free time, she enjoys playing tennis, golf and traveling with family and friends.

Crystal Kherkher, PA-C

Aesthetic & Regenerative Master Provider, Master Injector, Lead Aesthetic Consultant

Crystal Kherkher, PA-C is from From Troy, Michigan. She graduated from Oakland University with a Health Science Bachelors in Rochester, Michigan, then graduated with her Masters in Physician Assistant Studies from Midwestern University in Downers Grove, Illinois.

Crystal worked at a top 10 Allergan account in Southern California, then transitioned to Northern California as a Lead Clinician for a Plastic Surgery and Dermatology practice.

She loves combining medicine with aesthetics and being able to positively directly impact peoples self-confidence, and her strengths are full facial and body balancing as well as skin rejuvenation treatments.

Outside of the office, Crystal enjoys working out, playing all sports, traveling, going to concerts and spending time with loved ones.

Kayla Patnode, PA-C

Regenerative Medicine, Bioidentical Hormone & Weight Loss Specialist

Kayla Patnode, PA-C, our CSLC and RegenCen Master Provider, graduated with a Bachelor's of Science in Kinesiology with a minor in health promotion from Michigan State University. She graduated from Mary Baldwin University, Murphy Deming College of Health Sciences with Masters in Physician Assistant Studies.

She worked previously worked as a Certified Nursing Assistant (CNA) at a nursing home and rehabilitation facility in Lansing, MI and as a Medical Assistant (MA) in a dermatology office in Novi, MI. Kayla completed a PA school rotation in Lansing, MI where she was trained in treating varicose veins, acne, and hormone replacement therapy.

Kayla enjoys helping patients feel more confident and assisting with making their “ideal self” match what they see in the mirror. She loves our regenerative services for helping patients continue to feel like themselves as they move through the journey of life.

Outside of the office, you'll find Kayla waterskiing (she competed on the Michigan State University waterski team for 4 years and was the first female to serve as men’s captain of the team), disc golf, hiking, and camping.

Aynsley Vanderkarr, PA-C

RegenCen & CSLC Master Provider, Master Injector, Aesthetic Consultant

Aynsley Vanderkarr is a physician assistant and graduated from Central Michigan University. Aynsley has worked in emergency medicine, urgent care, and now in aesthetic medicine. Aynsley is certified in injectables including neurotoxin and filler, and is furthering her training at Chelsea Laser & Aesthetics. Outside of work she enjoys being active and spending time with her husband, family, and German shepherds. She loves to travel and especially loves camping.

Katherine Hillig, NP

RegenCen & CSLC Master Provider, Master Injector

I am so excited to be working with Dr Howlin and Holly at Chelsea Laser and Aesthetics offering filler and neurotoxin treatments. I specialize in brow lifts, the dreaded ‘11s’, crows feet, lip flips and reversing signs of aging with discreet yet effective use of fillers in the cheeks, chin, hands and lips. After training under Dr Howlin, I follow her ‘less is more’ philosophy, with natural and stunning results.

I also offer health and wellness coaching. This is a physician led, science based “Optavia” program addressing life long changes in health habits. We focus on achieving optimal health: healthy weight, balanced nutrition, increased energy and sleep quality while reducing inflammation.

I'm originally from New Zealand but recently relocated from Colorado with my husband and two boys to be closer to our family. We are loving all that Michigan has to offer, particularly in the summer!

Megan Marzec, APRN-CNP

RegenCen & CSLC Master Provider, Master Injector

Megan is from Toledo, Ohio and is our Master Regenerative Medicine Provider and Injector in our Ann Arbor office. She graduated with her BSN from The University of Toledo in and started her career as an RN in the ICU at Toledo Hospital. She graduated with her Master of Science in Nursing from Walden University and began pursuing her dream career as an aesthetic nurse practitioner.

She enjoys her career in aesthetic and regenerative medicine because it is the perfect blend of her two passions: the opportunity to take care of aging patients combined with her artistic skills/passion for skincare. Megan loves helping others carry themselves more confidently and feel more beautiful in their own skin.

We're grateful to have Megan on our team with her outstanding leadership abilities, dedication to our team, detail orientation, abilitiy to adapt with our growth, and her focus on team goals.

Outside of the office, Megan loves traveling, hiking, photography, cycling, running, and spending time with her nieces + nephews.

Samiha Rahman, PA-C

REGENERATIVE MEDICINE SPECIALIST

Samiha Rahman, PA-C is our Florida Regenerative Medicine, Bioidentical Hormone & Medical Weight Loss Specialist.

She earned her Master of Medical Science in Physician Assistant Studies from Nova Southeastern University in Orlando, FL and her Bachelor of Health Science from University of Florida in Gainesville, FL.

She worked as a Certified Nursing Assistant at UF Health Physical Rehabilitation Center, completed dermatology-focused clinical rotations, and uses her knowledge to help patients make the best decisions regarding their aesthetic and regenerative health treatments.

Samiha loves this industry for the opportunity to consult with patients about ways to improve their lifestyle and then getting the chance to be a part of their journey to optimize the way they look on the outside and feel on the inside.

She is empathetic and positive, caring, and easy to talk to, which our patients (and our staff!) love about her. She will make you feel both comfortable and educated during your visits to CSLC / RegenCen.

During her free time, Samiha loves going to theme parks, watching the most beautiful Florida sunsets on the beach, and trying new cuisines.

Amanda Rapanos, PA-C

Clinical Director and Medical Lead

Shauna Stark, DNP-BC

Doctor of Nursing Practitioner, Regenerative Specialist

Shauna Stark, DNP-BC joined RegenCen as our Doctor of Nursing Practice in our Petoskey, Michigan office in 2023. She holds her DNP and BSN from the University of Michigan-Flint, her BS in Biology from University of Detroit Mercy, and also obtained her EMT before pursuing nursing. She is a current standing Professor of Graduate Pathophysiology at her alma mater, University of Michigan-Flint.

She uses her extensive medical expertise to practice as a well-rounded, proficient, and trustworthy provider and aesthetic treatment consultant. Prior to discovering her passion for the industries and launching her career in Regenerative Medicine and Aesthetics, Shauna worked in Critical and Acute Care at McLaren. She has traveled internationally to Kenya, Cambodia, and the Dominican Republic as a provider and educational lead with the University to educate nursing students and help patients worldwide.

As a compassionate individual and talented provider in every facet of the industry, she is proud to help extend the healthspan of RegenCen patients. Shauna is passionate about travel and art. In her spare time, she enjoys spending time with her husband and golden retriever, being outside and drawing.

At RegenCen, Shauna offers:

  • PRF (platelet-rich fibrin) injections
  • Feminine or vaginal rejuvenation
  • Hormone replacement
  • IV therapy
  • Complimentary regenerative consultations

Teresa Vettese, NP-C

Regenerative PCP

Teresa Vettese, FNP-BC, joined Cosmetic Skin & Laser Center | RegenCen as an Aesthetic & Regenerative PCP in 2024. Teresa’s passion for holistic medicine and commitment to innovative treatments make her a trusted provider for patients seeking to look and feel their best. Known for her expertise in longevity and regenerative care, Teresa stays ahead of advancing medical developments, ensuring that her patients receive the most effective, personalized care. Whether you’re looking to move without pain, manage weight loss, or optimize your overall wellness, Teresa’s holistic approach delivers results that enhance your quality of life.

At Cosmetic Skin & Laser Center | RegenCen, Teresa offers bioidentical hormone therapy, hormonal consultations, and effective weight management solutions to patients in Petoskey, Michigan. As a leading expert in regenerative medicine, she is dedicated to providing wellness solutions tailored to the needs of those in northern Michigan. With a focus on personalized care and patient satisfaction, Teresa is committed to helping you achieve lasting, transformative results. Schedule your consultation today to discover why patients across Petoskey and northern Michigan choose Teresa for their regenerative care needs.

Anna Donaghy, NP-C

RegenCen Feminine Rejuvenation, Weight Loss & Hormone Expert

With years of experience in women’s health and regenerative medicine, Anna, NP-C, is a trusted expert in hormone replacement therapy, menopause management, and regenerative treatments. Known for her warm and compassionate care, Anna helps patients confidently navigate midlife health challenges. Her personalized approach ensures every patient receives a tailored treatment plan designed to address their unique needs, providing lasting results and improving overall wellness.

At CSLC & RegenCen in Traverse City, Anna offers a comprehensive range of transformative services to patients looking to restore their health and vitality. Specializing in hormone therapy and bioidentical hormone replacement therapy, Anna provides a holistic approach to managing menopause symptoms such as hot flashes, mood swings, and thinning hair. Additionally, Anna offers vaginal rejuvenation and joint pain relief solutions. As a certified Biote pellet practitioner, Anna tailors each hormone therapy plan to meet the unique needs of her patients, ensuring they receive long-lasting results with minimal discomfort.

Women and men visiting RegenCen in Traverse City leave feeling empowered and rejuvenated, with renewed energy and confidence. Whether you’re struggling with menopause symptoms or low testosterone symptoms, hoping to feel and move better, or seeking relief from chronic pain, Anna is dedicated to providing effective, customized solutions to fit your lifestyle. Schedule your consultation with Anna at RegenCen in Traverse City and start your journey toward renewed vitality today!

Andrea Dunklow, NP-C

Master Injector, Medical Lead, Regenerative Medicine Specialist

Andrea, FNP-C, brings over 20 years of healthcare expertise to her role as a trusted Aesthetic & Regenerative PCP in Traverse City, Michigan. Her extensive medical background includes roles in emergency medicine and as a Sexual Assault Nurse Examiner (SANE), which have honed her precision, compassion, and dedication to personalized care. Since joining Cosmetic Skin & Laser Center & RegenCen in Traverse City in 2023, Andrea has helped clients in northern Michigan achieve stunning, natural-looking results while restoring their confidence and vitality. Known for her approachable demeanor and gentle touch, Andrea ensures every patient feels supported and empowered throughout their journey.

Andrea provides a comprehensive range of services in Traverse City and Suttons Bay, including Botox, dermal fillers, bioidentical hormone therapy, low-T treatments, menopause medicine, and medical weight loss solutions. Whether you’re seeking to enhance your appearance or regain energy and balance, Andrea tailors every treatment to your individual needs and goals. She proudly serves clients from across northern Michigan, helping them look and feel their best. Don’t wait to take the first step toward confidence and wellness — schedule your consultation with Andrea today at our Traverse City or Suttons Bay office.

Martin Pontasch, MD

Medical Director, Board Certified Emergency Physician; Aesthetic Medicine; Associate Professor of Medicine

Bio coming soon!

Rajesh Vindhya, MD

Board Certified Internist and Geriatrician; Aesthetic Medicine

Bio coming soon!