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Cosmina Cristea
DO
Dr. Cristea graduated from Philadelphia College of Osteopathic Medicine (Suwanee, GA) in 2017. She completed her residency in general surgery at Sky Ridge Medical Center (Lone Tree, CO) in 2022. Dr. Cristea joined Indiana Surgical Associates as a general surgeon in 2022. She is a member of the American Society of Colon and Rectal Surgeons, the American College of Physicians, the American Osteopathic Association, and the Christian Medical Dental Association. She practices all aspects of general surgery with special interests in advanced laparoscopic and minimally invasive surgeries, as well as, breast cancer surgery.
Office Address: 3500 Franciscan Way, Suite 3A, Michigan City, IN 46360
Phone: (219) 861-8828
Fax: (219) 861-8827
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Jason Douglas
MD, FACS
Dr. Douglas graduated from University of Illinois College of Medicine in May 2012. He completed his residency in general surgery at William Beaumont Hospital in 2019. After residency, Dr. Douglas was a staff general surgeon with Coleman Medical Associates in Canton, Illinois and then as a staff general surgeon at Great River Health in West Burlington, Iowa. Dr. Douglas joined Indiana Surgical Associates in 2025. He practices all aspects of general surgery with special interests in minimally invasive surgery.
Office Address: 3500 Franciscan Way, Suite 3A, Michigan City, IN 46360
Phone: (219) 861-8828
Fax: (219) 861-8827
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Brendan P. Frawley, Jr.
MD, FACS
Dr. Frawley attended medical school at the University of Chicago – Pritzker School of Medicine. He went on to residency in general surgery at the University of Chicago Hospitals. He served as administrative chief resident and completed his residency in 1996. Subsequently, he served on the faculty of the University of Chicago Department of Surgery before joining Indiana Surgical Associates in 1998. Dr. Frawley is a member in good standing of multiple area hospitals. He also holds a clinical faculty appointment with Indiana University and is active in teaching third year medical students. Dr. Frawley practices broadly in general surgery but also specializes in laparoscopic surgery, biliary surgery, and cancer surgery including breast, colorectal, and intraabdominal malignancies.
Office Address: 12800 Mississippi Pkwy, Suite C100, Crown Point, IN 46307
Phone: (219) 662-5585
Fax: (219) 662-5586
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Tom N. Galouzis
MD, FACS
Dr. Galouzis graduated with honors from The University of Chicago Pritzker School of Medicine in 1990 and was selected to the Alpha Omega Alpha Honor Society. He completed his residency in general surgery at The University of Chicago in 1995, where he served as chief resident from 1994-1995. After completing his residency, he took a faculty appointment at The University of Chicago, where he served as a Clinical Instructor of Surgery from 1995-2004. In 1995 he also started Indiana Surgical Associates, where he continues to serve as both surgeon and director of the group. Dr. Galouzis is a member of the American College of Surgeons, and is a fellow in the Society of Surgical Oncology. He has authored several journal articles and abstracts, and serves as an active member on numerous committees. He holds a clinical faculty appointment with Indiana University and is active in teaching third year medical students. He is also an adjunct professor of biology at Purdue North Central Campus. Dr. Galouzis practices broadly in general surgery but also specializes in laparoscopic surgery, biliary surgery, and cancer surgery including breast, colorectal, and intraabdominal malignancies.
Office Address: 101 E 87th Ave, Suite 420, Merrillville, IN 46410
Phone: (219) 769-2041
Fax: (219) 769-2313
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Anna Gillio
MD, MPH
Dr. Gillio grew up in Pennsylvania, but has spent most of her adult life in the Midwest. She graduated from Northwestern University with a degree in public health and social policy. After college, she worked on public health projects in Chicago, Central America, and East Africa, fostering a strong interest in health equity and a deep commitment to working with medically- underserved populations. She ultimately made the decision to pursue a medical career, and graduated from Sidney Kimmel Medical College in 2016. She completed her residency in general surgery at Indiana University School of Medicine in 2023. While in residency, she completed a global surgery fellowship in partnership with Moi University in Kenya, and also earned her master of public health degree in epidemiology. She then completed one year of a vascular surgery fellowship at Medical College of Wisconsin before joining Indiana Surgical Associates in 2025. Dr. Gillio prides herself on creating safe and inclusive spaces for patients and colleagues alike. She was recognized for her compassionate and collaborative approach to patient care with induction into the Gold Humanism Honor Society in 2023, and for her advocacy for mental health among medical trainees with the Stand FIRM award in 2023. She was also recognized for excellence in teaching for several consecutive years during her training, and hopes to continue to participate in medical education throughout her career. She speaks Spanish and is excited to serve the Spanish-speaking community of northwest Indiana. Outside of work, she loves wheel throwing pottery and spending time with her husband, daughter, and dogs. Dr. Gillio practices all aspects of general surgery with special interests in minimally invasive surgery and inclusive healthcare.
Office Address: 3500 Franciscan Way, Suite 3A, Michigan City, IN 46360
Phone: (219) 861-8828
Fax: (219) 861-8827
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Languages Spoken: English, Spanish.
La Dra. Gillio creció en Pennsylvania, pero ha pasado la mayoria de su vida adulta en el Medio Oeste. Se graduó de la Universidad Northwestern con un título en salud pública y políticas sociales. Después de la universidad, trabajó en proyectos de salud pública en Chicago, América Central y África Oriental, fomentando un fuerte interés en la equidad en salud y un profundo compromiso con el trabajo con poblaciones médicamente desatendidas. Finalmente, tomó la decisión de seguir una carrera médica y se graduó del Sidney Kimmel Medical College en 2016. Completó su residencia en cirugía general en la Facultad de Medicina de la Universidad de Indiana en 2023. Mientras estaba en residencia, completó una beca de cirugía global en asociación con la Universidad Moi en Kenia, y también obtuvo su maestría en salud pública en epidemiología. Después de esto, completó un año de una beca en cirugía vascular en el Colegio Médico de Wisconsin antes de unirse a Indiana Surgical Associates en 2025. La Dra. Gillio se enorgullece de crear espacios seguros e inclusivos para pacientes y colegas por igual. Fue reconocida por su enfoque compasivo y colaborativo en la atención al paciente con su inducción a la Sociedad de Honor del Humanismo en 2023, y por su defensa de la salud mental entre los médicos en formación con el premio Stand FIRM en 2023. Ella habla español y está emocionada de servir a la comunidad de habla hispana del noroeste de Indiana. Fuera del trabajo, le encanta hacer cerámica en el torno y pasar tiempo con su esposo, hija y perros. La Dra. Gillio practica todos los aspectos de la cirugía general con intereses especiales en la cirugía mínimamente invasiva y la atención médica inclusiva.
SI DESEA PROGRAMAR UNA CITA, PÍDALE A UN AMIGO O FAMILIAR QUIEN HABLE INGLÉS QUE LLAME A LA OFICINA PARA PROGRAMAR LA CITA. CUANDO LLEGUE, SU CITA ESTARÁ EN ESPAÑOL. -
Elizabeth Herber
MD, FACS
Dr. Herber earned her Bachelor’s degree in Biology in 1989 before spending 10 years as an EMT and paramedic. She went on to receive her medical degree from the Joan C. Edwards School of Medicine at Marshall University in 2005. Dr. Herber completed her surgical residency at the University of Illinois Chicago Metro Group in 2010, followed by a fellowship in Minimally Invasive and Foregut Surgery at the University of Nebraska Medical Center in Omaha. Dr. Herber practices general, breast, minimally invasive, and foregut surgery. In her free time, she enjoys spending time with her dogs and grandchildren, as well as hiking, gardening, and horseback riding.
Office Address: 3500 Franciscan Way, Suite 3A, Michigan City, IN 46360
Phone: (219) 861-8828
Fax: (219) 861-8827
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Sha-Ron Jackson-Johnson
MD
Dr. Jackson-Johnson is a native of rural Helena, Arkansas and a proud alumnus of Xavier University of New Orleans, Louisiana. She graduated with honors from Meharry Medical College and was selected for membership in Alpha Omega Alpha Honor Medical Society. She completed her General Surgery residency at the University of Cincinnati and served as Chief Resident from 2013-2014. During her surgical training, Dr. Jackson-Johnson worked as a research fellow at Childrens Hospital of Los Angeles where she studied physiologic mechanisms of lung injury and repair in transgenic mouse models. She has presented her basic science and clinical research at national meetings and has authored several abstracts and manuscripts. Following completion of surgical residency, Dr. Jackson-Johnson joined the surgical faculty of the University of Cincinnati where she worked closely with the City of Cincinnati Health Department to provide surgical services to medically underserved patient populations. Dr. Jackson-Johnson is a member of the American College of Surgeons and the Society of Black Academic Surgeons. In the fall of 2016, she enthusiastically joined Indiana Surgical Associates. Dr. Jackson-Johnson offers expertise in broad based General Surgery, including advanced laparoscopic procedures. She maintains robust interest in the elimination of health care disparities, recruitment and retention of women and minorities in surgical specialties and the provision of excellent medical student education.
Office Address: 101 E 87th Ave, Suite 420, Merrillville, IN 46410
Phone: (219) 769-2041
Fax: (219) 769-2313
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Jocelyn M. Logan
MD, FACS
Dr. Logan graduated from Northwestern University Feinberg School of Medicine and attended the University of Cincinnati for her General Surgery training. She completed a research fellowship in Surgical Oncology where she received first place from the American College of Surgeons Commission on Cancer for her research in pancreatic cancer. During her surgical training, she was awarded the Golden Humanism Award and selected for the Alpha Omega Alpha Society Membership. Upon completion of her training in 2010 she joined the faculty of the University of Cincinnati as an Assistant Professor of Surgery and served as the Associate Program Director for the residency training program until joining Indiana Surgical Associates in 2018. Dr. Logan is passionate about global healthcare disparities and developed a partnership with Mzuzu Central Hospital in Malawi, Africa in 2015 and continues to serve as Director of this program. Dr. Logan practices all aspects of general surgery with a special interest in advanced laparoscopic and GI surgery, including antireflux and esophageal motility disorders.
Office Address: 101 E 87th Ave, Suite 420, Merrillville, IN 46410
Phone: (219) 769-2041
Fax: (219) 769-2313
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Mark A. Mueller
MD, FACS
Dr. Mueller attended Quincy University followed by medical school at the University of Illinois Chicago. After completion, he went on to a general surgery residency at Mount Sinai Medical Center in Chicago. He was selected to be chief resident his final year and was the Dr. Thomas Vargish award recipient for excellence. Dr. Mueller moved to Northwest Indiana in 2005 and has been a partner with Indiana Surgical Associates ever since. Dr. Mueller is active within the medical staff at all the hospitals he serves with titles such as Chief of Surgery and Section of Surgery Chairperson as well as serving on numerous committees. He is also involved with the University of Indiana Medical School lecturing and proctoring students during their third year clerkships.
Office Address: 12800 Mississippi Pkwy, Suite C100, Crown Point, IN 46307
Phone: (219) 662-5585
Fax: (219) 662-5586
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Christopher R. Mussman
DO, MS
Dr. Mussman earned his Bachelor of Science at The University of Illinois at Urbana-Champaign in 2007 and a Master of Science from Western Illinois University in 2008. He graduated from Midwestern University Chicago College of Osteopathic Medicine in 2012 and completed his general surgery residency through Franciscan St. James Health in 2017. He has been honored with the “Humanism and Excellence in Training Award for Outstanding Resident Role Model” by the Arnold P. Gold Foundation and is the recipient of the 2017 “Outstanding Resident of the Year in Surgery Award” by the American Osteopathic Foundation. Dr. Mussman joined Indiana Surgical Associates in the summer of 2017. He practices all aspects of general surgery, as well as, advanced laparoscopic surgery.
Office Address: 12800 Mississippi Pkwy, Suite C100, Crown Point, IN 46307
Phone: (219) 662-5585
Fax: (219) 662-5586
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Jonathan Patterson
DO
Dr. Patterson comes from a farming family in Northwest Indiana. He graduated from Midwestern University, Chicago College of Osteopathic Medicine in 2003. He was awarded as Surgery Student of the Year and the Award for Academic Achievement, Professional Demeanor and Meritorious Work. He completed his internship and residency in general surgery at Midwestern University, St. James Hospitals in 2008 and served as Chief Resident from 2007-2008. He then completed a fellowship in Cosmetic Surgery in 2009. He began practicing in Northwest Indiana in 2009 and ultimately joined Indiana Surgical Associates in June, 2011. Dr. Patterson is a member of American College of Osteopathic Surgeons, American Academy of Cosmetic Surgeons, and American Osteopathic Association. He is interested in all areas of general surgery and also body cosmetic surgical procedures.
Office Address: 101 E 87th Ave, Suite 420, Merrillville, IN 46410
Phone: (219) 769-2041
Fax: (219) 769-2313
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Bryan Robins
MD
Dr. Bryan Robins is a native of suburban New York City, growing up in Ossining, NY. Dr. Robins graduated from the University of Maryland-College Park Honors Program and obtained his medical degree from Rush Medical College in 2017. He completed his preliminary internship at University of California-San Francisco before moving closer to home to complete his surgical residency at Stony Brook University in 2023. He then completed a Minimally Invasive Surgery/Advanced GI fellowship at University of Texas- Houston Health in 2024. Here, he honed his skills in a broad range of surgical procedures, specializing in minimally invasive techniques, especially in the area of robotic colon and rectal surgery. In addition to his clinical practice, Dr. Robins is an active member of the Society of Gastrointestinal and Endoscopic Surgeons and will be applying for inclusion into the American College of Surgeons at the completion of his first year of practice. He has contributed to several peer-reviewed journals. Outside of the operating room, Dr. Robins enjoys traveling and he is an avid golfer and sports fan. He enjoys reading especially by the water, hiking, and volunteering in local health initiatives to promote community wellness as well as international medical missions.
Office Address: 101 E 87th Ave, Suite 420, Merrillville, IN 46410
Phone: (219) 769-2041
Fax: (219) 769-2313
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James Siatras
DO, FACS
Dr. Siatras graduated from Midwestern University, Chicago College of Osteopathic Medicine in 2006. He completed his residency in general surgery at Midwestern University, St. James Hospitals in 2011, where he served as Chief Resident from 2010-2011. He then went to Indiana University where he completed a fellowship in advanced laparoscopic and bariatric surgery. He joined Indiana Surgical Associates in 2012, and also serves as the director of bariatric and metabolic surgery at Methodist Hospitals, Northwest Indiana Center for Bariatric Surgery. Dr Siatras is a member of American College of Osteopathic Surgeons as well as American College of Surgeons. He also maintains memberships in Society of Gastrointestinal and Endoscopic Surgeons and American Society of Metabolic and Bariatric Surgery. He has presented at multiple national meetings and has authored several abstracts. Dr. Siatras practices all aspects of general surgery and specializes in advanced laparoscopic surgery, gastrointestinal surgery, as well as bariatric and anti-reflux surgery.
Office Address: 101 E 87th Ave, Suite 420, Merrillville, IN 46410
Phone: (219) 769-2041
Fax: (219) 769-2313
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Dana-Rachael Smith
MD
After graduating from Ross University School of Medicine, Dr. Smith was fortunate to gain invaluable experience in her preliminary surgical residency at multiple programs, including Maimonides Medical Center in Brooklyn, New York, and University of Maryland. She completed her residency at Henry Ford in Detroit, Michigan. She also spent two years at St. Louis University undertaking pediatric trauma research. After residency, Dr. Smith pursued and completed a Mastery of General Surgery Fellowship with a focus on robotics at Arizona Premier Surgery. Prior to joining Indiana Surgical Associates, Dr. Smith practiced as a general surgeon in Toledo, Ohio. Dr. Smith is a board certified general surgeon that practices all aspects of general surgery with a special interest in hernia repair and robotic surgery.
Office Address: 12800 Mississippi Pkwy, Suite C100, Crown Point, IN 46307
Phone: (219) 662-5585
Fax: (219) 662-5586
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Sandra M. Wischmeyer
DO
Dr. Wischmeyer graduated from Midwestern University Chicago College of Osteopathic Medicine in 2012. She completed her residency in general surgery at Franciscan St. James Health in 2017. After residency, she went on to Ascension St. Agnes Healthcare in Baltimore, Maryland where she completed a fellowship in bariatric surgery. Dr. Wischmeyer joined Indiana Surgical Associates in 2018. She is a member of American College of Osteopathic Surgeons, American Osteopathic Association and American Society of Metabolic and Bariatric Surgery. She practices all aspects of general surgery with special interests in advanced laparoscopic and minimally invasive weight loss surgery.
Office Address: 3500 Franciscan Way, Suite 3A, Michigan City, IN 46360
Phone: (219) 861-8828
Fax: (219) 861-8827
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Eric Woo
DO, FACS
Dr. Woo graduated from Midwestern University, Chicago College of Osteopathic Medicine in 2002. He completed his internship and residency in general surgery at Midwestern University, St. James Hospitals in 2007. He was chosen as Intern of the Year in 2003 and served as Chief Resident from 2006-2007. He stayed on as a general and trauma surgeon at St. James after completing residency. He was chosen as Educator of the Year at St. James in 2009. He was the Program Director of the general surgery residency program from 2010-2012. He joined Indiana Surgical Associates in the Fall of 2012. Dr. Woo is a member of American College of Osteopathic Surgeons and American Osteopathic Association. He is interested in all areas of general surgery, and enjoys providing a whole person approach to each patient.
Office Address: 12800 Mississippi Pkwy, Suite C100, Crown Point, IN 46307
Phone: (219) 662-5585
Fax: (219) 662-5586
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