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Our team

Our distinguished faculty of doctors and surgeons are the core of our residency program. They are committed to providing unparalleled training on the full scope of the oral and maxillofacial surgical specialty. You’ll partner closely with program leaders, attending staff, anesthesiologists, and other head and neck specialists whose collective experiences and interests fuel an exceptional residency experience.

Program director

Martin J. Koop, DDS

Martin J. Koop, DDS
Martin J. Koop, DDS Program Director, Oral and Maxillofacial Surgery Residency

Dr. Koop earned his DDS at the University of Minnesota School of Dentistry in 1985 and completed his Oral & Maxillofacial Surgery residency at the Naval Medical Center in San Diego, Calif., in 1995. He is board certified in Oral & Maxillofacial Surgery by the American Board of Oral and Maxillofacial Surgery. He joined Gundersen in 2010. 


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Residency faculty

Lauren Castro, DMD, MD

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Mark Erickson, DDS

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Deepa Sathiah, DDS

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Residency program administrator

Kathy Thoen


Residency program assistant

Jennifer Ellingson


Why Gundersen

Aerial view of la crosse, wisconsin.

Call La Crosse Home

We have it all in La Crosse, Wis. Our vibrant city and region support your dream lifestyle with a welcoming community, culture and outdoor adventure.

Explore La Crosse
Single family home near Gundersen's campus.


Steps from our flagship medical center in La Crosse, our housing options allow you to enjoy the company of your family and the comradery of your colleagues.

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Residents kayaking the Kickapoo river.

Prioritizing Your Wellness

As you learn how to become the clinician you aspire to be, we’ll provide space to prioritize your mind and body wellness, and reach the work-life balance you need.

Wellness opportunities
Contact our team

We’re here to answer your questions. 

Email us

1900 South Ave.
La Crosse, WI 54601

(608) 782-7300

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