Surgical Associates Southern Indiana

Welcome to Surgical Associates Southern Indiana (SASI), a practice designed for the unique surgical needs of today’s patients.

SASI is a group of four board certified physicians who offer comprehensive surgical services. We provide complete surgical care for patients from early childhood through the aged, including cancer surgery, hernia surgery, colon surgery, gallbladder surgery, breast surgery and endoscopic procedures (colonoscopies/EGD).

All four of our physicians provide surgical services at Clark Memorial Hospital, and our office provides the latest technology and has the ability to perform Ultrasound Guided Breast Mammotome, a much less invasive breast biopsy, requiring only local anesthetic. This procedure may not be appropriate for all patients.

We go to great lengths to help you understand everything related to your surgery, from the procedure itself to the preparations you’ll need to make and what to expect in the hours and days following your surgery. Read more about your surgery at the American College of Surgeons.

We want to make sure we address any specific concerns and questions to your complete satisfaction, and to assure you that our entire team is devoted to providing you with the best possible care before, during and after surgery. We are also committed to working closely with your physician and communicating with him or her at every stage of care.

The practice which today is Surgical Associates Southern Indiana was founded in 1969 by Dr. Gordon Gutmann. Dr. Gutmann’s reputation as a medical professional and as a leader in the local medical community is unsurpassed in the region.

Read more about surgical options available through Clark Memorial Hospital.

Our Medical Staff

Daniel C. MacMillan, MD, Attending Physician, General Surgery

Dr. MacMillan received his undergraduate degree in Biology in 1985 from the University of Louisville, and his degree in medicine in 1989 from the University of Louisville School of Medicine. He completed his post graduate training, including his Internship and Residency in General Surgery, at the University of Kentucky Medical Center in 1996.

Dr. MacMillan is certified by the American Board of Surgery and is a Fellow, American College of Surgeons. He is a member of the Clark County Medical Society, Greater Louisville Medical Society, Indiana State Medical Association, and Society of American Gastrointestinal Endoscopic Surgeons, 1999.

A native of the Louisville area, Dr. MacMillan has been with Surgical Associates Southern Indiana since July 1996.


Sandra N. Seneshen, MD, Attending Physician, General Surgery

Dr. Seneshen received her degree in medicine in 1989 from the University of Saskatchewan, Saskatoon, Canada. She completed her post graduate internship at Lion’s Gate Hospital, North Vancouver, British Columbia in 1990, and her residency in General Surgery at Plains Health Centre, Regina, Canada, in 1995.

Dr. Seneshen is certified by the Royal College of Surgeons of Canada and by the American Board of Surgery, and is a Fellow, American College of Surgeons. She is a member of the Clark County Medical Society, Greater Louisville Medical Society, and the Indiana State Medical Association.

A native of Saskatchewan, Saskatoon, Canada, Dr. Seneshen has been with Surgical Associates Southern Indiana since July 2000.

Meet Dr. Seneshen


Wendell L. Bailey, MD, Attending Physician, General Surgery

Dr. Bailey, a native of Bath County Kentucky, has been with Surgical Associates Southern Indiana since 2002. He received his undergraduate degree, with Honors, Biology in 1984 from Hanover College, and his degree in medicine in 1988 from the University of Louisville School of Medicine. He completed his post graduate training, including his Internship and Residency in General Surgery at the University of Kentucky Medical Center in 1993.

Dr. Bailey is certified by the American Board of Surgery and is a Fellow, American College of Surgeons. He is a member of the Clark County Medical Society, the Greater Louisville Medical Society, and the Indiana State Medical Association.

Meet Dr. Bailey


Patri M. Marconi, MD, Attending Physician, General Surgery

Dr. Patri M. Marconi, a Chicago native, joined Surgical Associates Southern Indiana in August 2013. She completed her residency in General Surgery at Rush University Medical Center at Stroger Cook County Hospital in Chicago, Il. Dr. Marconi earned her Medical Degree from the University of Illinois College of Medicine. Dr. Marconi is certified by the American Board of Surgery, is a member of Clark County Medical Society and Greater Louisville Medical Society.

Meet Dr. Marconi


Ashley Ocker, Physician Assistant   

Ashley received her undergraduate degree in biology and chemistry at Western Kentucky University and went on receive her Masters in Physician Assistant Studies at Kettering College in Kettering OH. She completed the Physician Assistant National certifying exam and received her certification in 2014. Before coming to Surgical Associates in April 2016, Ashley worked at Emergency Medical Specialists in Dayton, OH. Ashley is a member of the American Academy of Physician Assistants and the Ohio Association of Physician Assistants.

Meet Ashley