Meet Our Staff

man, woman, daughter and dog

Dr. Jeff Siems                                                                      Diplomate, American College of Veterinary Radiology  

 Dr. Siems moved to Spokane, WA in 1999 and opened Inland Empire Veterinary Imaging. When away from the office he enjoys traveling, spending time with his family, the outdoors, hunting, and fishing. 


Undergraduate:  Major - Biology, Minor - Chemistry; 
Eastern Montana College, Billings, MT; 1987                      

Masters Degree:  Bioveterinary Science;
Utah State University, Logan, UT; 1989                                            

Veterinary School:  Oregon State University, Corvallis, OR; 1993  

Internship:  Small Animal; Purdue University, West Lafayette, IN; 

Residency:  Diagnostic Imaging; Purdue University; West Lafayette, IN; 1994-1997                                             

Clinical Instructor:  Diagnostic Imaging; Purdue University, West Lafayette, IN; 1997-1999                                     

Board Certification:  American College of Veterinary Radiology;  1998

Jessica Malberg, DVM, MSPH, DACVR
Pax Harness, DVM, DACVR
Cristina Geston, DVM, Resident 

Two people outside in snow on dog sled

Dr. Natasha Walzthoni
DVM, Resident of Radiology 

Dr. Walzthoni was born and raised in Newfoundland, Canada. She completed a Bachelor of Science (Honors) at the Memorial University of Newfoundland and completed her Doctor of Veterinary Medicine at the Atlantic Veterinary College in Prince Edward Island. She then moved back home and completed rotating and diagnostic imaging internships at the Veterinary Specialty Centre of Newfoundland and Labrador. She went on to practice as an emergency veterinarian at the VCA Canada Calgary Animal Referral and Emergency (CARE) Center until she joined our residency program. She has strong interests in both diagnostic imaging and emergency medicine alike. Outside of veterinary medicine, she spends her time hiking in the summer and skiing in the winter. She loves to spend time with her family and two cats - Zoey and Boo-berry.

Undergraduate: Bachelor of Science with Honors - Memorial University of Newfoundland

Veterinary School: Atlantic Veterinary College in Prince Edward Island      

Residency: Inland Empire Veterinary Imaging - Current            
Troye Myers, DVM, Resident - Coming Soon!
Torrey Tyrrell, DVM, Resident - Coming Soon!
Mary Mary Vawter                                 
Practice Manager 

Mary came to work for IEVI in October of 2000 as a transcriptionist, and in 2006 we added manager to her title.  She enjoys spending time with her husband, kids, and grandkids: cooking, baking, and building forts.  

Person and large dog Stephanie Altamirano
Lead Licensed Veterinary Technician

Stephanie joined our team in March of 2020. She has been a credentialed veterinary technician since 2014 after graduating from College of Southern Idaho. She has a wide variety of experience including exotics, emergency and specialized practice. Stephanie spends her free time with her husband, 2 kids, 3 dogs and 1 cat. They like to get outside snowboarding, mushroom hunting and biking. 

Heather Heather Robb                                                                      Veterinary Assistant  

Heather started working at veterinary clinics at the age of 15 and started at IEVI in 2008. She has a mini zoo of farm animals, including her Gypsy Vanner horses which she breeds. In her spare time she enjoys riding her horses, cooking, and spending time outdoors with her son.

Coming Soon!
Rosalie Trapani, Receptionist
Mandy Holling, Receptionist 
Brittany Martin, Veterinary Assistant 
Kyle Schoben - Veterinary Assistant
Emily Hernandez - Veterinary Assistant


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Office Hours


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm


8:00 am-5:00 pm