Our Team

Medical Director

David Calderwood, MD graduated from the University of Washington in Seattle in 1981. He completed a 3 year Family Practice Residency program and passed his American Board of Family Medicine in 1984. He worked in hospital emergency departments for 20 years during which time he also passed the American Board of Emergency Medicine exam. In 2004 he left the practice of emergency medicine and began practicing family medicine until 2020. In that year he left office practice and began treating COVID-19 patients and Long COVID patients.

CEO & Clinic Director

Certified Health Coach, Researcher

Medical Doctor
Alice Tzeng, MD spent most of her life in NJ, and graduated college from the New Jersey Institute of Technology.

She received her M.D degree from the University of Dentistry of Medicine and Dentistry - New Jersey Medical School, now part of Rutgers University. Prior to starting her internship and residency, she did a year-long research fellowship with the National Institute on Disability and Rehabilitation Research. Afterwards, she completed a residency program in Physical Medicine and Rehabilitation at Kessler Institute for Rehabilitation and practiced as a board-certified physiatrist in NJ, specializing in evaluating and treating injuries and diseases causing loss of function, disability, and pain. She, her husband, and 3 children moved to Huntsville from NJ in July 2022. Due to the birth of her first child, as well as having a brother-in-law and mother who were diagnosed with cancer, Dr. Alice began seeing the limitations of western medicine and became intrigued with holistic medicine. She became a certified Root Cause Protocol consultant to help those who want to optimize their health by addressing the root causes of disease.

Dr. Alice is currently a medical consultant for her husband's law firm, Citizensoldierlaw.com, which serves the military and veterans, particularly in helping them with getting disability benefits and now joins the Sparrow team and hopes to be a blessing to her patients with her knowledge of both traditional western medicine and holistic medicine.

Family Nurse Practitioner

As a dedicated and compassionate Nurse Practitioner (NP) at Sparrow, I am committed to providing high-quality healthcare services to individuals and families in our community. With a strong background in primary care and a love of holistic wellness, I strive to empower my patients to achieve their health goals and lead fulfilling lives.

My journey in healthcare began in 1992 at Calhoun Community College, where I gained valuable clinical experience and developed a passion for patient-centered care. I continued my education and earned a Bachelor of Science in Nursing and 2 Master degrees (MSN) with the last being a specialization in family practice, further enhancing my clinical skills and knowledge. Lastly, I completed a terminal degree with a Doctorate in Nurse Science from UAH to better understand research and education. As you can see, I love to learn and do not plan to stop anytime soon! I am dedicated to staying current with the latest advancements in healthcare through continuing education and professional development.

At Sparrow, I collaborate with a multidisciplinary team of healthcare professionals to provide comprehensive and personalized care to each patient. My areas of expertise include preventive medicine, chronic disease management, wellness counseling, and health education. I believe in building strong relationships with my patients based on trust, empathy, and open communication.

When I am not working, I travel with my husband to visit our 6 children and 2 grandchildren, garden, read, and attend my favorite bible studies. We also love kayaking, hiking, and eating. 

I am honored to be part of the Sparrow team and look forward to making a positive impact on the health and well-being of our patients.

Nurse Practitioner

I am passionate about health and wellness, both personally and professionally. I see my patients as a whole- mind, body, and spirit. I have over 11 years of experience in healthcare. I graduated from the University of Alabama with my BSN, then from the University of South Alabama with my MSN. While I have spent most of my healthcare career in ICU and Hospitalist roles, I am committed to keeping my patients out of the hospital. Improving my patient’s quality of life through the lens of holistic care brings me such joy!I was born and raised in Birmingham, where I currently live with my husband and 3 children. During my free time, haha just kidding what parents have free time, I homeschool my kids. Instilling a love of learning, an appreciation for nature, and preserving a wild and free childhood is important. Rapid fire of things I enjoy- hiking, spending time outdoors with family, walking with neighbors/friends, anything stars and space related, living room dance parties, sunsets, being barefoot, gardening, homemade anything, trail running, and movie quoting.My family is blessed to attend a local church where I have the privilege to serve with kid’s ministry. Jesus Christ is the savior of my life. May my life and gifts bring all the glory to Him.I am honored to be part of the Sparrow team. I look forward to serving our community through compassionate and comprehensive care. I am devoted to the ongoing journey of expanding my knowledge for the betterment of our community and patients.

Registered Nurse & Infusion Specialist

Ginger is an exceptional infusion professional with over 20 years of experience in the medical field. Ginger
brings a wealth of knowledge and a compassionate approach to patient care that is truly unmatched.

Ginger's impressive background includes 7 years in medical-surgical and hematology-oncology, 12 years in emergency medicine, and 7 years as a PICC/Vascular Access Provider. Most recently, she has spent 5 years at McMinn Clinic, specializing in advanced nutraceuticals, functional infusions, and heavy metal toxicant infusions. Her certifications speak to her commitment to staying up-to-date with the latest advancements in her field.

But it's not just Ginger's expertise that sets her apart—it's her unwavering belief in personalized care and treating each patient as a unique individual. She wholeheartedly embraces a blend of functional, Eastern, and allopathic modalities, always striving to provide the best possible treatment for those under her care but above all, FIRST DO NO HARM

Patient Care Coordinator

Samford Health Sciences Graduate, Certified Emotion Code Practitioner

Chief Marketing Officer