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Dr. Kathy Zelken is returning as an aesthetic medicine provider after a hiatus since the birth of her daughters. She has served as the medical advisor of the Zelken Institute for Aesthetic Medicine since it was established in 2016. She has worked tirelessly in the background to ensure the highest level of excellence and quality in all aspects of patient care. She has had a keen eye for artistry since childhood, starting from being a classically trained artist. She graduated summa cum laude from the University of California Berkeley with a major in Molecular and Cell Biology and a minor in Art History. During medical school at the University of Texas Southwestern, she published papers with world-renowned plastic surgeon and former editor-in-chief of Plastic and Reconstructive Surgery journal (the top journal in the field), Dr. Rod Rohrich. Her meticulous nature, extraordinary calmness, and friendly demeanor gained from close to a decade of working as a board-certified pediatrician in Orange County and doing some of the most delicate procedures on tiny babies will put the most anxious patients at ease. She is thrilled to help patients map out a comprehensive treatment plan to achieve their individual aesthetic goals and explain various nonsurgical procedures in detail. Her patients love her and seek her out for neuromodulator and facial contouring injections, skin rejuvenation, laser treatments, and so much more.

Dr. Daniel A. Steigelman, M.D., earned his Bachelor of Science in Bioengineering from the University of California, Berkeley, before receiving his medical degree from the Uniformed Services University of the Health Sciences (USUHS) in Bethesda, Maryland. He completed his post-graduate medical training through the San Antonio Uniformed Services Health Education Consortium (SAUSHEC), where he finished both his residency in Pediatrics and his specialized fellowship in Allergy and Immunology.

Dr. Steigelman is double board-certified, holding credentials as a Diplomate of the American Board of Allergy and Immunology and a Diplomate of the American Board of Pediatrics. These certifications qualify him to diagnose and manage allergic, asthmatic, and immunologic conditions in both children and adults. Alongside his clinical work, he has stayed active in medical education, serving as an Associate Professor of Pediatrics and Medicine at USUHS.

Before transitioning to private practice, Dr. Steigelman spent his career as an active-duty physician in the United States Air Force. During this time, his leadership roles included serving as the Consultant to the USAF Surgeon General for Allergy and Immunology and directing SAUSHEC's Transitional Year residency program. Following his retirement from active duty in April 2026, he joined Allergy and Asthma Specialist Doctors, Inc., providing dedicated care to patients in the Los Angeles community.

Erica Chen, MD, is a board-certified allergy and immunology specialist practicing at the Allergy and Asthma Specialist Doctors, Inc. location in West Covina, California. Her practice is centered around the treatment of allergic diseases, including nasal allergies and asthma.

Dr. Chen earned her medical degree from the Keck School of Medicine at the University of Southern California. Subsequently, she completed her combined internal medicine pediatric residency and allergy and immunology fellowship training at the Los Angeles County Hospital at the University of Southern California.

Dr. Chen is board certified by the American Board of Allergy and Immunology. She has contributed to multiple peer-reviewed scientific presentations and publications. She also holds numerous professional society memberships, including the American Academy of Allergy Asthma and Immunology and the American College of Allergy, Asthma and Immunology.

Dr. Chen is currently accepting new patients and looks forward to welcoming them to Allergy and Asthma Specialist Doctors, Inc.

From 2012 to the present, Maria has worked one-on-one with children and adults who have been diagnosed with autism spectrum disorders in clinical, home, and school settings. Maria has training in crisis prevention intervention and experience in Applied Behavior Analysis (ABA), application of behavioral principles and teaching procedures (e.g., Reinforcement, Extinction, DTT, NET, PRT, etc.). She is a certified trainer and is proficient in the implementation and programming across evidence-based curriculums (e.g., PECS, PEAK, VB-MAPP, ACT, AIM, Essentials for Living, The AFLS, ABLLS-R, Vineland, The PEERS, etc.), parent education and social skills training. Maria has had additional experience and exposure to working with children with ADHD, oppositional defiant disorder, learning disabilities, cerebral palsy, down syndrome, OCD, depression, and social anxiety disorders.

Dr. Charles Song brings extensive medical experience to his practice, Song Institute of Allergy, Asthma and Immunology in Manhattan Beach, California. He specializes in the complex diagnosis and treatment of allergies, while focusing on each individual and taking care to provide comprehensive care that improves their quality of life.

After receiving his medical degree from Northwestern Medical School, Dr. Song completed his residency at the University of Southern California, County Medical Center. From there he went on to finish his fellowship in allergy and immunology at Harbor-UCLA Medical Center. Dr. Song is a Diplomate of the American Board of Allergy and Immunology and a Fellow of the American Academy of Allergy, Asthma and Immunology.

Dr. Song describes his career as a happy marriage of private practice and academic pursuit. He has cared for thousands of satisfied patients across different specialties: general pediatrics, adult and pediatric allergy, and immunology. He has taught and trained many young physicians for more than two decades at Harbor-UCLA Medical Center. Although he has been involved in bench research, his true love lies in patient care and teaching. He’s thankful that his current practice offers him opportunities to pursue both lifelong passions.

Dr. Song has enjoyed living in the South Bay area since 1974 with his wife, his two (now grown) children, and two energetic grandchildren. He stays involved in the community in various roles, currently as a board member of Manhattan Beach School Health Advisory Board.

Grace Moussa, M.D., completed her medical degree at Kuwait University School of Medicine. She took her training at St. Mary's Hospital, University of Connecticut, Yale University, and Columbia University. Dr. Moussa has been practicing since 1994 as a physician. She speaks English, Arabic, French, and medical Spanish languages.

Dr. Noosha Shaheedy is a board-certified pediatrician who serves residents in the Century City and Los Angeles, California, areas. At Shaheedy Medical Corporation, she offers sports physicals, check-ups, vaccinations, developmental assessments including management of ADD and ADHD, and obesity consultations. Dr. Shaheedy also provides diagnosis and treatment options for asthma, allergies, eczema, and ear infections. Her goal is to provide the best healthcare possible to each of her clients through every stage of their growth and development.

Dr. Shaheedy graduated from Hahnemann University, now known as Drexel University College of Medicine in Philadelphia, PA in 1996 with her medical degree. She then went on to complete her residency at Cedars-Sinai Medical Center, where she specialized in pediatrics. Dr. Shaheedy is certified by the American Board of Pediatrics, and she’s an active Fellow of the American Academy of Pediatrics. Her hospital affiliation is at Cedars-Sinai Medical Center in Los Angeles.

To begin your journey to better health with Dr. Shaheedy, book an appointment with her online or call the office.

Sindu Pillai, MD, is an award-winning pediatrician who provides care at her private practice, Dr. Sindu Pillai, MD Inc., which has two offices in Murrieta, California. Dr. Pillai’s love for children and the desire to help them grow into healthy adults motivated her to choose a career in pediatrics.

After graduating from TD Medical College in Alappuzha, India, with a gold medal award (award for earning the highest marks in all subjects), Dr. Pillai relocated to the United States. She moved to Chicago, Illinois, to complete her pediatric residency at Cook County Hospital. 

Before opening her practice in the Temecula Valley in 1998, Dr. Pillai practiced general pediatrics in the western suburbs of Chicago. 

Dr. Pillai’s compassionate care for her patients has not gone unnoticed. She received the best pediatrician award five years in a row and is an award winner from the American Academy of Pediatrics (AAP) PREP®.  

Dedicated to her profession, Dr. Pillai is an attending physician for the Family Medicine Residency, Newborn Nursery UHS Southern California Medical Education Consortium in Temecula, California. She’s also a Fellow of the American Academy of Pediatrics (FAAP).

Dr. Pillai is married and has two children. She has a passion for classical music and dance and is a patron of Indian dance and music. In her free time, she enjoys being with her friends and family and organizing and participating in various cultural activities in her community.