Meet The Doctors


Dr. Nathan Hein, DVM

Nathan Hein, DVM was born and raised in Eastern Iowa.  Nathan garnered both his undergraduate and veterinary degrees from Iowa State graduating from the College of Veterinary Medicine in 2004. Nathan then completed an internship program and practiced as an associate veterinarian in Houston, Texas prior to moving back to Iowa. 

Nathan and his wife Joanna took ownership of Heartland Animal Hospital in October of 2010.  With great support from the community of Marion, the hospital grew to a point where it needed more space to meet the needs of its growing client base.  In 2015, he led the construction of the new hospital at its current location.

Dr. Hein's professional interests include ophthalmology, diagnostic imaging (radiology and ultrasonography), dental care, and surgery.  Nathan continues to pursue on-going education in dental care and ultrasound to enhance the hospital’s service in these two areas. 

He enjoys golfing, triathlons, and spending time with his family. A great passion of Nathan’s is supporting and attending Iowa State University football and basketball games with his family. 


Dr. Joanna Mangold, DVM

*** Coming Soon ***

Dr. Jillian Becker, DVM

Dr. Jillian Becker graduated from North Carolina State University College of Veterinary Medicine in May of 2018.  A North Carolina native, she moved up to Iowa after graduation to start a new adventure!  Although the winters are frigid, she fell in love with the truly kind-hearted people, rolling hills, and rural communities that predominate eastern Iowa.  Her professional interests include geriatric medicine and palliative care, internal medicine, and feline medicine.  Dr. Becker is excited to join the team here at HAH to serve the Marion community and work with clients to ensure the best care for their pets!
Outside of work, Dr. Becker devotes lots of time to her own demanding house cat, ChocolateFace.  She also enjoys riding her off-track Thoroughbred, Rolo, cycling with the Peloton community, and playing trivia.  Most of all, Dr. Becker loves to positively impact her local community and is honored to work with colleagues at Heartland who share these values!

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