Chief Residents

Tim Irwin | Byron Nielsen | Heather Osborn

Tim Irwin, M.D.

Tim received his bachelors and masters in Biomedical engineering at the University of Iowa prior to completing his medical degree in 2005.  He completed his internal medicine residency in 2008.

Following chief residency, he plans to pursue a Cardiology fellowship at the University of Michigan.

His hobbies include recreational shooting, pheasant hunting, home repair, and spending time with his wife and daughter.

Byron Nielsen, M.D.

Byron received a degree in Microbiology in 1999 from South Dakota State University followed by completion of training as a paramedic in 2000.  He then entered the working world and was employed for one year as a paramedic for the Brookings Ambulance Service prior to entering medical school at the University of South Dakota.  He completed his medical degree in 2005 and subsequently his Internal Medicine Residency at the University of Iowa in 2008.  Following his chief resident year, he will be starting a Nephrology fellowship at the University of Iowa.

Byron is the proud father of 6 year old son, Bailey, and is awaiting the arrival of another son in August.  Byron and his wife Stacey have been happily married for 8 years.

His hobbies include pheasant hunting, camping, bowling, and most of all, spending time with his family.

Heather Osborn, M.D.

Heather received her bachelor’s degree in Biology from Albion College (Albion, Michigan) in 1998. She attended school in Germany briefly then returned to Michigan to work in a physiology lab at the University of Michigan. She moved to Connecticut in 2000 and worked as a research assistant at a mathematics and science academy in Hartford, until starting medical school at the University of Michigan in the fall of 2001. She completed her medical degree in 2005 and her residency in 2008. She plans to pursue a fellowship in Pulmonary and Critical Care Medicine at the University of Iowa following her chief year.

Heather’s hobbies include traveling with her husband Andy, snowboarding, camping, hiking and not pheasant hunting.