Meet Our Staff
Dr. Steven G. Werdehoff, MD
Dr. Steven Werdehoff is a board-certified Emergency Medicine physician and board member of the non-profit organization HEMSI. He graduated in 1994 with a B.S. in Chemical Engineering at the University of Virginia. He had a gap year in Lake Tahoe, California, skiing and exploring the West before attending the University of South Alabama College of Medicine, where he graduated with his MD in 2000.
Dr. Werdehoff completed his residency in Emergency Medicine at the University Hospital of Cincinnati in 2004. Believing in the power of exercise to maintain health, he has pursued CrossFit for the past 8 years. Dr. Werdehoff enjoys spending time with his children, particularly through games, competitions, and sports. In addition, he has a knack for the kitchen, striving to master new ways to tempt the taste buds. Dr. Werdehoff became a founder of Synergy Wellness to help patients reach their potential in health and wellness.
Dr. Michael Chang, MD
Dr. Michael Chang is a native of Houston, TX. He received his Bachelors of Science at Stanford University, then went on to the University of California San Francisco School of Medicine, where he obtained his Doctorate of Medicine in 1996. In 1998, Dr. Chang completed his General Surgery internship at the University of Texas in Houston, and in 2000, he completed an Emergency Medicine residency at Vanderbilt University.
Trained and boarded in Emergency Medicine, Dr. Chang brings more than 20 years of experience managing and treating sick patients, from sports injuries to heart attacks. His clinical interests also include wellness and addiction medicine, which stems from his passion for helping others live healthier and happier lives. Dr. Chang also brought his business expertise to the practice of medicine, as he was instrumental in the start-up and management of several free-standing ERs in Texas. In addition to clinical practice, Dr. Chang also serves as a team physician for the Houston Texans. Dr. Chang enjoys physical fitness, watching football, and spending time with family in his spare time.
Dr. Martin F. Schreeder, MD
Dr. Martin F. Schreeder, a native of Huntsville, AL, is a board-certified Emergency Medicine physician. In 2006, he graduated from Washington and Lee University with a Bachelor of Science in Chemistry – Engineering. Upon graduation, he continued his studies at the University of Alabama School of Medicine. He completed his medical training and residency in Emergency Medicine at Louisiana State University School of Medicine in Shreveport, Louisiana.
Dr. Schreeder continues to practice Emergency Medicine, but he began practicing in urgent and non-emergent outpatient clinic services over the years. Beginning in residency, Dr. Schreeder worked in the field of Urgent Care. Later, after moving to Huntsville with his wife Caroline, he wanted to respond to the opioid overdose and suicide crisis in a preventative way and continued education and certifications in medication-assisted therapy or MAT. By responding to the crises of treatment-resistant depression, substance use disorders and addiction, chronic pain, and PTSD, Dr. Schreeder hopes that MAT can save lives and prevent certain emergencies altogether.
Dr. Damon Fierro, MD
Amy Hunter, DNP, CRNP
Amy Hunter is a native of Jackson County, AL and has been in nursing for 20 years. In 2001, she started her career as a nurse, specializing in medical-surgical nursing and Gerontology. In 2013, she graduated from The University of Alabama in Huntsville as a Family Nurse Practitioner. She continued her education and in 2015, graduated from The University of Alabama in Huntsville with her Doctor of Nursing Practice degree.
Amy has been practicing as a Family Nurse Practitioner since 2013. She specializes in Internal Medicine and Urgent Care. She enjoys working with patients of all ages and treating the whole person using evidence-based practice. Amy also has been teaching at UAH in the college of Nursing since 2014. She enjoys academia and teaching the future of nursing to care for the aging population. She loves staying active in the community, including serving and volunteering
Sydney Thornhill, CRNP
Sydney Thornhill is a native of Huntsville, AL and has been in nursing for 5 years. She is a Certified Registered Nurse Practitioner specializing in Family Medicine. In 2016, she graduated from the University of Alabama, where she received her Bachelor of Science in Nursing.
Sydney continued her education, graduating from the University of Alabama in Huntsville with a Masters of Science in Nursing in 2018. Sydney got married in October to her husband, Wes, and together they try to live a healthy lifestyle by eating nutritious foods and staying active.
Mary Sparks, CRNP
Mary Elaine Sparks is a native of Birmingham, AL, and has been in nursing for 18 years. She is a Certified Registered Nurse Practitioner specializing in Geriatrics and Emergency Medicine. In 2003, she graduated from Bevill State Community College as an LPN. In 2014, she received a Bachelor of Science in Nursing from the University of Alabama.
Mary continued her education in 2019, graduating from the University of Alabama in Huntsville with a Masters of Science in Adult Gerontology-Acute Care Nurse Practitioner. Mary takes pleasure in serving the Huntsville community. In her free time, Mary enjoys going on hikes around the area and four wheeling with her family.