About EMR
We Provide High-Quality Products, Technical Excellence and Practical Engineering at an Economical Price
EMR Corporation was founded in 1980 by William Lieske, Sr. as an OEM supplier of ferrite and hybrid devices to the land mobile communications and broadcast industries. Until his passing in 2007, Bill was involved in radio communications for more than 70 years. Beginning with a radio amateur license at the age of 13, he went on to work in military radar, public safety, radio communication manufacturing and commercial corporate sales. As the chief engineer, Bill’s approach to R.F. systems component design was without parallel in the industry. Bill’s work has helped set standards in the U.S. and international land mobile communications and antenna site management industries. Soon after founding EMR Bill expanded his scope of activities to include the design and manufacturing of ferrite and cavity resonant devices and complex combinations of R.F. filtering products, such as antenna duplexers, hybrid and cavity resonant combining networks and receiver multicoupling.
In early 1992, EMR began manufacturing amplifiers for land mobile and broadcast receiver applications. EMR’s product line now includes a line of receiver pre-amplifiers, hybrid dividers and amplifiers in various bands for up to 250 watts output power. as well as advanced product for in-building signal enhancement applications and web based antenna site monitoring. EMR offers a complete line of antenna site and mobile application filtering products covering the R.F. spectrum from 30 MHz to 2.8 GHz.
William Lieske, Sr. retired from day-to-day operations in 1999, but remained active in the company until his death. Bill Lieske, Sr. passed away on January 9, 2007. William Lieske, Jr. had taken over general management of the company by the late 1990s and continues today as President and CEO of EMR Corporation. The legacy of Bill Lieske, Sr has given Bill Jr the training and tools to continue operations with an efficient and effective team of highly trained, motivated, dedicated employees. With our specialized team members providing leadership, top notch engineering and state of the art manufacturing we design and manufacture a wide variety of custom products as well as products for standardized applications. EMR excels in unique designs to meet exact customer requirements.
Meet The Team!
Doug Ferrini
VP of Engineering
Rod Defoor
Manufacturing & Design
Kahtan Al-Hashimi
Safety & Quality Control Manager
Billy Jack Vallejo
Machine Shop Manager
Michelle Yager
Sales Associate
Check back soon for more Team bios!
Doug Ferrini
VP of Engineering
Doug Ferrini is our Vice President of Engineering and has been designing RF systems for EMR Corporation for over 25 years. Originally form Upstate New York he joined the Navy in 1981 and was stationed on the Nuclear Aircraft Carrier, USS Carl Vinson. After discharge from the Navy Doug attended and graduated from California Polytechnic State University, located in San Luis Obispo, CA in 1992, with a Bachelor of Science in Electrical Engineering Degree. After graduation he moved to Phoenix, AZ and started at EMR Corporation that same year. He has been doing RF systems design, custom BDA head-end and DAS systems designs ever since. Doug has gained the intimate understanding of the ins and outs of RF that only decades of hands-on experience can provide.. His impeccable attention to detail and motivation to solve complex design problems has garnered acclaim by customers and industry professionals alike. Doug loves hunting (especially High Country Elk and Fine Bourbon), classic rock music, and spending time with family. He’s passionate about football and is a die-hard Arizona Cardinals fan like most at EMR Corporation.
Rod Defoor
Technical Systems Manager
Rod Defoor has been with EMR for 29 years and is a driving force of our manufacturing and design division. He had the privilege of working with EMR’s founder, Bill Lieske Sr., as his mentor. Like many of us at EMR, Rod and his family are big time Cardinal football fans and attend many games together. He loves riding his Harley Davidson and enjoys the outdoors. We can always depend on Rod to put a smile on our faces with his sense of humor and larger than life attitude as he makes his grand entrance at work every morning!
Kahtan Al-Hashimi
Quality Control & Safety Manager
Kahtan Al-Hashimi is our Safety and Quality Control Manager who has been with EMR for over 23 years. He’s worked through every department pertaining to manufacturing and assembly and has applied his vast experience to ensure quality standards of EMR products are maintained, while ensuring safety measures are upheld throughout our facilities. Kahtan has worked tirelessly to keep safety our number one priority as we continue day to day operations. “I’m very proud of the work I do, manufacturing high quality RF products, and ensuring all employees go home safe at the end of each work day.” Kahtan loves movies, collecting Star wars memorabilia and Retro Jordans, and is an avid sports fan of the Chicago Bears, Bulls, and the Cubs. Being Chicago born himself, this comes as no surprise!
Tracy Trujillo
Technical Systems Manager
Since joining EMR in 1993, Tracy Trujillo has worked in every production department. For the past several years, Tracy has worked in our Systems Design Division where he has put his in-depth knowledge of the EMR product line to great use, always starting with a listening ear to customer requirements in order to design a solution to meet their needs. In his free time, Tracy enjoys spending time with his wife and son, playing guitar, and working on his 1965 Ford Mustang. As loyal AZ Cardinals fans, he and his family and have been season ticket holders for decades. Now that’s what you call sticking by your team through good and bad!
Billy Jack Vallejo
Machine Shop Manager
Billy Jack Vallejo has worked his way through our machine shop to become Machine Shop Manager. He’s very hands on, always willing to contribute in any capacity the situation calls for. EMR’s executive management team understands that high performance team members are a critical part of our success and Billy represents this to a “T”. Billy’s hobbies and interest are hiking, all outdoor sports, and most importantly us wife and two children. Two of his fun family adventures are Airsoft shooting and rock hounding which is fun for the whole family and the children love navigating the courses and terrain. Billy is also a Grateful Dead super fan and goes to their concerts every chance he gets!
Michelle Yager
Sales Associate
Michelle has been with EMR Corp. for over 14 years and is most likely the first person you will speak with when you call. She is excellent at multi-tasking and is very knowledgeable on our products. When not at the office Michelle enjoys spending time with her two granddaughters and is a lover of animals including her cat named Trouble. Michelle is also a “crazy NASCAR fan”, in her own words. Maybe this is why she is always running around at full speed!