Jim is the founder and principal of Plus Four Marketing. Prior to Plus Four, Jim began his career at Leo’s Music / Pro Audio in Oakland, Sound Genesis in San Francisco, and Just Noticeable Difference (JND) in Marin. He built his career from the ground up, learning from the best and brightest in the industry. Jim is still active in the production side of the industry working concerts and sporting events on the weekends. You can learned more about his hobbies on his Linked-in page,

Keith Erickson – Production AVL Specialist
 510.459.7461 Mobile 

Keith comes to Plus Four with a deep knowledge of the production business. Still a working audio engineer, Keith has also accepted the challenge of the lighting and video side of our business as well. He provides a resource for the entire company when it comes to live production. This includes Tour, House of Worship and Performing Arts Centers. Really anywhere where live production takes place. Keith is an excellent audio system technician and front of house engineer. Keith has been with the company for 11 years. 

T-2 has a long history in our business. He has worked several capacities in the business including Magnolia, (Best Buy high end integration), CompView (now DSI) and Commercial Sound all located in the Seattle Metro area. In each instance Todd was in a leadership role, managing people and projects. Todd has a clear understand of the marketplace in terms of roles. Including the consultant, the integrator, the bid process, the design build process and how he fits in as a manufacturers’ representative. Although Todd has only been with the company for a couple of years, he has learned the job at hand very fast and brings great knowledge and confidence to his business partners. 

Sean has been with Plus Four since 2007, going on 12 years. Sean manages the company’s outgoing marketing material, (newsletter) and provides both pre and post-sale support for dealers and end-users. He is a trusted resource that is always available. Helping with design, tracking down a shipment, helping an end-user connect to a system are all part of Sean’s expertise.  In addition to his inside responsibilities, Sean is responsible for many of the Guitar Center locations in terms of training and merchandising. Sean is a performing guitarist that hosts an evening show once a week. 

Mark Morgan – Pacific Northwest – MI Retail
 425.923.3883 Mobile

After twelve years in music retail sales, management and purchasing Mark started his career as a manufacturers’ representative in 1993 in the Pacific Northwest. Prior to Plus Four, Mark was an associate at Loppnow Associates. During his tenure at Loppnow, Mark was associated with prestigious lines like Sony, QSC, Symetrix, Rane, Electro Voice.  Mark joined Plus Four in 2011 shortly after the company was awarded the territory by Harman Professional.  Mark is well known in the area as both a representative and guitar player. Like many of the others at Plus Four, he is still engaged in live performance. He regularly plays with the best musicians in the Seattle area, including some of the dealers he is responsible for as a representative.  

 Jennifer Horn – Office Manager

Jennifer Horn is the best of the best when it comes to making things happen. She is relentless in representing both our manufacturers and our customers providing a win / win result. Jennifer is very organized and is always on top of every situation. She has a track record of following through until all parties are satisfied.  Prior to Plus Four, Jennifer oversaw the re-directing of lost shipments for DHL Air Freight. Jen has been with Plus Four since 2010. She has provided the company a new sense of organizational skills requiring everyone to pick-up their game. Jennifer’s husband Jeremy is an audio engineer. She’s 24-7 AV. 

 Allison Mathews – Finance & Accounting 
510.459.7463 Mobile

Allison has been running the financial side of the company almost since its inception. Her responsibilities include payroll, healthcare, accounts payable and receivable, taxes and insurance. In addition, she coordinates convention travel and special events where Plus Four is the host. Allison is very detail oriented in terms of every facet of her