Specialists

Xavier Rambaud

Co-FounderIn-Person

Hospitality-trained co-founder shaping Maison Epigenetic client experience, operations, and service flow

Marieta Ramírez Bermúdez, MD

Independent PracticeIn-Person

Regenerative gynecology, menopause, pelvic floor care, hormone therapy, laser, and PRP for intimate health

Alessandra Ramos, RD

DietitianIn-Person

Clinical, functional, sports, and nutrigenomic nutrition from a 34-year Brazilian dietitian

Ricardo Rancan, RD

DietitianIn-Person

Weight-loss nutrition that combines practical eating with movement planning from a dual-degree provider

Graziela Ravacci, RD, PhD

DietitianIn-Person

Metabolomic nutrition, microbiome interpretation, and chronic-disease prevention from an FMUSP PhD researcher

Emily Reich, RD, LD, CDN

DietitianIn-Person

Integrative nutrition for complex gut, autoimmune, hormonal, and metabolic concerns

Bruna Reis, RD

DietitianIn-Person

Precision nutrition for metabolic health, weight, muscle, gut inflammation, and nutritional genomics

Courtney Reum

Co-FounderTelehealth

Columbia-educated entrepreneur, M13 co-founder, VeeV Spirits co-founder, and Lifeforce founding investor-operator

Tim Reus, AEP

Exercise PhysiologistIn-Person

Exercise physiologist and nutritionist turning assessment results into exercise, rehab, and behavior-change plans

Kathryn Rexrode, MD, MPH

Scientific AdvisorIn-Person

Chief Academic Officer at Brigham and Women's, advising Lifeforce on women's cardiovascular and midlife health

Claire Richardson

FounderVirtual + In-Person

Health scientist and Second Prime creator shaping GHS Clinics around midlife longevity and coordinated care

David Richardson

Department HeadIn-Person

Systemic therapy leadership for anxiety, mood, stress, relationships, and lifestyle change inside GHS care pathways

Functional medicine workups from an Argentine-trained ENT physician reviewing labs inside SHA Spain stays

Walter Robb

Co-FounderIn-Person

Former Whole Foods co-CEO and food-systems investor helping shape Love.Life's integrated wellness strategy

Karin Robbins, LCSW, MSW, SEP

PsychologistVirtual + In-Person

LCSW and somatic therapist helping Love.Life members work with trauma, stress, nervous-system patterns, and body awareness

Tony Robbins

Co-Founder

Life Force co-author and longevity-company co-founder translating proactive health into mainstream consumer language

Rebecca Roberts, BBus, BPsych

Health CoachIn-Person

Health coaching and corporate partnerships at Veritas, shaped by business and psychology training

Precious Ann Rondero, RND

DietitianIn-Person

Lead nutritionist guiding assessment-first dietary plans and Cibus food-as-medicine work

Nathan Ruch, MD, FACEP

Assistant Medical DirectorIn-Person

Healthspan and hormone-optimization physician focused on TRT, menopause, thyroid support, and lab-matched symptoms

Pamela Ruiz, PA-C

Physician AssistantIn-Person

Primary-care PA-C turned precision-medicine clinician focused on prevention, nutrition, and chronic-disease risk

Mary Russo, PA-C

Physician Assistant

Psychiatric PA background with 20+ years in healthcare and six years in ketamine infusion therapy

Functional movement assessment and sport-specific conditioning from a Polish elite-tennis performance coach

Preventive-medicine internist with Columbia MPH training and Montefiore/Einstein faculty leadership

Strength and endurance coaching from a junior bodybuilding champion turned mountain ultramarathoner

Emilie Sagripanti, MD, CCFP, MSc

Clinical LeadIn-Person

Toronto family physician leading Lifespire's women's longevity program, with clinical nutrition training and a PCOS focus

Dayle Sampson, PhD

Head of Research

Elysium VP of Bioinformatics leading APEX algorithm work behind the Index biological-age test

María Sánchez-Izquierdo Vecino, Lic

DietitianIn-Person

Microbiota-focused nutrition, digestive health, inflammation, supplementation, and longevity diet support

Cynthia Sass, MPH, MA, RDN, CSSD

DietitianIn-Person

Nutrition science advisor with plant-based, sports, nutrigenomics, media, and bestselling-author depth

Kristian Schoppaul, APRN, FNP-C

Nurse PractitionerVirtual + In-Person

Hormone replacement care from an FNP-C with ER, ICU, oncology, cardiology, pediatrics, and sports-medicine experience

Marjan Segahyat, MD

Staff PhysicianIn-Person

Diabetes, thyroid, hormone, metabolic, and healthy-aging care from an internist-endocrinologist

Eran Segal, PhD

Scientific Advisor

Computational biologist behind the Personalized Nutrition Project — the microbiome and glucose-response research that defined biomarker-driven nutrition

Monica Sekowski, BPsych, MEdDevPsych, MClinPsych

PsychologistIn-Person

Clinical psychologist supporting LMI patients with sleep, eating-disorder expertise, and performance psychology

Rony Sellam

CEO

Healthcare-IT operator running InsideTracker as the personalized-health platform powering Boston-based longevity analytics

Hormone optimization and recovery-focused care from a family nurse practitioner with a Division 1 running background

Abdollah Serajian, PhD, ACSM-EP

Exercise PhysiologistIn-Person

Exercise prescription and performance physiology from a neuromuscular researcher and fencing coach

Functional nutritionist translating Elitra exam findings into food-as-medicine plans

Computational biologist and Tally founding member; first author of the peer-reviewed CheekAge buccal aging clock

Claire Siegel, RD

Executive

RDN-trained product leader running Humanaut's member product surface and coaching operations

Medical Services Director focused on gut health, microbiome balance, functional medicine, and patient education

Alessandro Silveira, PharmD, PhD

Consulting PhysicianIn-Person

Microbiome, pharmacogenetics, gut health, and medication review from a PhD clinical pharmacist

David Sinclair, PhD, AO

Co-Founder

Harvard geneticist behind the sirtuin and partial-reprogramming research that defines mainstream longevity science

Lori Skurbe, RDN, MPH, CDCES, CD-N

DietitianIn-Person

Diabetes-care and metabolic-health nutrition with public-health training and GLP-1 weight-loss support

Phillip Smith, DO

Medical DirectorIn-Person

Pain, spine, and regenerative-medicine physician serving as Humanaut's group medical director of record

Ryan Smith

Founder

Biochemist-operator leading TruDiagnostic's R&D, methylation algorithms, trials, and research partnerships

Daniel Sodickson, MD, PhD

Scientific Advisor

Chief Medical Scientist bringing parallel MRI, AI reconstruction, and preventive imaging depth to Function

Fatima Stanford, MD, MPH, MPA, FAAP, FACP, FTOS

Scientific AdvisorIn-Person

Obesity medicine physician scientist at MGH and Harvard advising Lifeforce on obesity care and healthcare policy

Anthony Stanislaus, MBBS, BMedSc, GDFM, EMBA, PBM

FounderIn-Person

Men's health, testosterone, STI/HIV care, metabolic screening, and prevention from Hisential's founder

Full-mouth rehabilitation and revision dentistry with ceramic implants, Slow Dentistry, and a digital CAD/CAM workflow