Our Team

Headshot of Acuity Eye Group co-founder Tom Chang MD smiling on a grey background

Tom Chang, MD

Founder & Managing Partner

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Headshot of Acuity Eye Group co-founder Michael Samuel smiling on a grey background

Michael Samuel, MD

Founder & Chief Medical Director

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Education & Innovation

Michael Davis, retina specialist at Acuity Eye Group

Michael Davis, MD

Fellowship Educational Director

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Vy Pham Optometrist Acuity Eye Group

Vy Pham, OD

Director of Optometry Services

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Pia Rios

Executive Director

Clinical Operations

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Alex Ashwal

Chief Operating Officer & Chief Financial Officer

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Alexander Macbeth - Vice President of Operations at Acuity Eye Group

Alex Macbeth

Vice President, Operations

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Christina Cruz

Director, Field Operations - Orange County

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Christina De Hoyos

Director, Field Operations - San Diego County

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Josh Eddy

Director, Field Operations - LA County

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Andrea Kane

Director, Field Operations - Orange County

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William Matthies

Director, Field Operations - San Diego

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Robert Miller, Director of Field Operations at Acuity Eye Group

Robert Miller

Director, Strategic Partnerships

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Clinical Engineering, Research & Development


Stephen Duncan

Vice President, Engineering

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Brett Harris

IT Services Manager

Mher Grigoryan of Acuity Eye Group

Mher Grigoryan

Manager, Special Projects

Stephen Jewell of Acuity Eye Group

Stephen Jewell

Systems Administrator

Nathan Lowry at Acuity Eye Group

Nathan Lowry

Principal Data Scientist


Rich Marotti Chief Compliance Officer At Acuity Eye Group

Rich Marotti

Chief Compliance Officer

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Terry Marchillo at Acuity Eye Group

Terry Marchillo

Contracts Manager

Marie Sakounphong of Acuity Eye Group

Marie Sakounphong

Compliance Manager


Alenoosh Namagerdi of Acuity Eye Group

Alenoosh Namagerdi

Director, Revenue Cycle

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Samantha Hofstad of Acuity Eye Group

Samantha Hofstad Chi


Siyouneh Torousian of Acuity Eye Group

Siyouneh Torousian

Revenue Cycle Manager

Enriqueta Cortes of Acuity Eye Group

Enriqueta Cortes

Revenue Cycle Manager

Mergers, Acquisitions, & Analytics

Derek Avdul of Acuity Eye Group

Derek Avdul

Senior Vice President, Corporate Development

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Teagan George of Acuity Eye Group

Teagan George

Senior Business Analyst

Human Resources

Jessica Carlson of Acuity Eye Group

Jessica Carlson

Vice President, Human Resources

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Celia Leung Director of HR

Celia Leung

Director, Human Resources

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Sheri Alley Credentialing Department of Acuity Eye Group

Sheri Alley

Director, Credentialing

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Arcy Bumgarner Payroll Manager

Arcelia Bumgarner

Payroll Manager

Winnie Chan

Winnie Chan

Human Resources Generalist

Kathy Peysar of Acuity Eye Group

Kathy Peysar

Corporate Recruiter


Acuity Eye Group VP of Marketing Laura Rod

Laura Rod

Vice President, Marketing

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Angie Berber Director of Call Center

Angie Berber

Director, Contact Center

Brittnie Salazar Acuity Eye Group

Brittnie Salazar

Senior Marketing Specialist

Clinical Research

Minerva Garcia Research at Acuity Eye Group

Minerva Garcia

Clinical Research Manager

Victoria Ramirez Research at Acuity Eye Group

Victoria Ramirez

Clinical Research Coordinator

monica chavez acuity eye group research

Monica Chavez

Clinical Research Asisstant

Ambulatory Surgery Centers


Nathan Dyska

Vice President, Ambulatory Surgery Centers

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Susi Khan Director of Nursing

Susi Khan

Director of Nursing

Nancy Montigny

Nancy Montigny

Director of Nursing

Our clinical leadership team is made up of 20 physicians who mentor our doctors and drive the clinical culture in our practices.