Meet Our Providers

Six board certified pediatricians, and highly qualified physician assistants and nurse practitioners make up South Coast Pediatrics, a professional medical group working together and dedicated to providing high quality health care for our Orange County community.


We appreciate the diversity of our patient’s cultures and beliefs, our caring and qualified providers respect, cherish, and represent this diversity.

To learn more about each practitioner, click on their photo below:

    Physicians

Jacob Wolsztejn, M.D.
Jacob Wolsztejn, MD
Raul Estrada, M.D.
Raul Estrada, MD
Juan Estrada, M. D.
Juan Estrada, MD

Errol Sosa, M.D.
Errol Sosa, MD
Haideh Mobarak, M.D.
Haideh Mobarak, MD
Lubna Ajmal, M.D.
Lubna Ajmal, MD

Providers

Kris Mackey, CPNP-PC
Kristine Mackey, CPNP-PC
Jaime Luna, PA-C
Jaime Luna, PA-C
Qianqian Zhang, CPNP-PC
Qianqian Zhang, CPNP-PC
Lien Chau, PA-C
Lien Chau, PA-C
Amanda Barrio, FNP-BC

Amanda Barrio, FNP-C
Talor Johnson, PCNP-PC

Talor Johnson, CPNP-PC
Marcela Andersen, CPNP-PC

Marcela Andersen, CPNP-PC
Elizabeth Tieu, CPNP-PC

Elizabeth Tieu, CPNP-PC
  • Lubna Ajmal, M.D.

    Certifications

    • American Board of Pediatrics, 2013

    Medical Education

    • Doctor of Medicine      Dow Medical College         1988-1995

    Residency

    • Pediatrics       Charles R. Drew University     2004-2007

    Languages Spoken

    • English
    • Spanish
    • Hindi
    • Urdu
  • Errol Sosa, M.D.

    Certifications

    • American Board of Pediatrics, 2004 

    Medical Education

    • Doctor of Medicine         Medical College of Pennsylvania & Hahnemann University       1995-1999
    • Bachelor in Biological Sciences        University of California, Irvine           1990-1995

    Residency

    Pediatrics        University of Illinois, Chicago      1999-2002

    Languages Spoken

    • English
    • Spanish

    Interests

    • Growth & Development
    • Sports Medicine
  • Haideh Mobarak, M.D.

    Certifications

    • American Board of Pediatrics, 2011 

    Medical Education

    • Doctor of Medicine     Hamedan University of Medical Science      1983-1991

    Residency 

    • Pediatrics        Charles R. Drew University          2004-2007
    • Pediatrics        Shahid Beheshti University of Medical Science        1992-1996

    Languages Spoken 

    • English
    • Farsi 
  • Jaime Luna, PA-C MU-Dr
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  • Kristine Mackey, CPNP
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  • Qianqian Zhang, CPNP
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  • Lien Chau, PA-C

    Certifications

    • Physician Assistant, California 
    • Physician Assistant, National Commission on Certification of Physician Assistants 

    Medical Education

    • Master of Physician Assistant    University of Southern California, Keck School of Medicine     2003
    • Bachelor of Science, Biology    University of California, Irvine     1998

    Languages Spoken

    • English
    • Vietnamese
    • Spanish

    Interests

    Read More
  • Amanda Barrio, FNP-BC

    Certifications

    • Family Nurse Practitioner - Board Certified, California 
    • Advanced Registered Nurse Practitioner, California
    • Advanced Registered Nurse Practitioner, Florida  
    • Registered Nurse, California
    • Registered Nurse, Florida 

    Medical Education

    • Master of Science in Nursing, Family Nurse Practitioner    University of South Alabama       2016
    • Bachelor of Science, Nursing      Florida State University      2008 

    Languages Spoken

    • English 

    Interests 

  • Mindy Phan, PA-C

    Certifications

    • Physician Assistant, California

    Medical Education

    • Master of Science, Physician Assistant Studies    College of Saint Mary       2016-2018
    • Bachelor of Science, Human Biology                  College of Saint Mary       2014-2016
    • Bachelor of Science, Biological Sciences            University of California, Irvine      2005-2007

    Languages Spoken

    • English
    • Vietnamese 

    Interests 

    • Medical mission trips, hiking, camping, cooking, baking, traveling, and family time 
  • Jacob Wolsztejn, M.D.
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  • Raul A. Estrada, M.D.

    Certifications

    • Board of Neonatal Perinatal Medicine, 1981
    • American Board of Pediatrics, 1979

    Medical Education 

    • Doctor of Medicine     University of San Carlos      1966-1971

    Internships 

    • Hospital San Juan Dias     Guatemala        1970-1971

    Residency

    • Pediatrics       Nassau County Medical Center      1977-1978
    • Pediatrics       Maimonides Medical Center           1975-1977
    • Pediatrics        IGSS General Hospital                   1971-1975

    Languages Spoken 

    • English
    • Spanish
  • Juan P. Estrada, M.D.

    Certifications

    • American Board of Pediatrics, 2004

    Medical Education

    • Doctor of Medicine       University of Southern California, School of Medicine   1995-1999
    • Bachelor in Biological Sciences       University of California, Irvine          1990-1995

    Residency

    • Pediatrics         University of Southern California, School of Medicine        1999-2002

    Languages Spoken 

    • English
    • Spanish 

    Interests

    • Gardening and spending time with family 
  • Marcela Andersen, CPNP-PC

    Learn more

    Read More
  • Talor Johnson, CPNP-PC

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  • Lorna Santiago, FNP-BC

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  • Thuy Nguyen, CPNP-PC

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  • Elizabeth Tieu, CPNP-PC

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    Read More



Please call 714-754-1444 to schedule an appointment