Meet Our Team

Stephanie Havens - Owner



Stephanie Havens, Owner, has had a love of German cars since she learned to drive in her Father’s 1970 Porsche 914-6 along the French Riviera. She mostly drove cars with manual transmissions, until she became a mother, as  she enjoyed the feeling of controlling the car’s dynamics and performance.

Her goal and the goal of all at RENN HAUS, is to ensure women be treated the way she expects to be treated and the company has accordingly developed a strong following among bright women who appreciate this approach!

After receiving her Ph.D. in Clinical Psychology, she worked in the Industrial-Organizational consulting field prior to co-founding RENN HAUS.  Despite not having the strong background in car repair estimating as everyone else at  RENN HAUS, she quickly picked up the knowledge required to provide estimates and helpful options to the customer.  Not surprisingly in light of her background, she is fluent in French and always enjoys conversing with  RENN HAUS' french-speaking customers! 

Shaun Lulofs - General Manager - 15+ yrs. experience 

  • Mercedes-Benz Trained Master Technician of 12 Years

  • ASE Master Technician

  • ASE L1 Certification

  • 2013 Mercedes-Benz Service Laureates Award Winner 

Mitchell Spetsios - Service Manager - 5+ yrs. experience

  • Mercedes-Benz STAR Certified Technician   


Steven Jones - 30+ Years Experience

Steven Jones

  • 30+ Years as BMW, Mercedes & Porsche Technician
  • Graduated from BMW Training in Berchtesgaden, Germany in 1976 (Bi-lingual in German and English)
  • 20 Years as Head of Engine & Drive Train Development and Tuning at Renntech Inc Florida specializing in MB, Porsche, BMW and MINI
  • Supercharged and Turbocharged many engines for maximum performance
  • Custom Fabrication of Stainless-Steel Exhaust Systems
  • Developed 6.5L Conversion for Porsche 928 S4
  • Developed Custom Mechanical Valve Train for MB 119 Engine

Steven Jones brings to RENN HAUS his 30+ years of extensive and impressive experience in servicing and maintenance, tuning, engine/transmission rebuilding and modification of Mercedes-Benz, SLR McLaren, Porsche, BMW, Mini and other exotic automobiles.

For the past 20 years Steven was the Director of Tuning and Engine/Transmission Development for Renntech Inc. in South Florida. Over this period he was a significant contributor in building Renntech into one of the largest and most successful tuners in the United States.

He has tuned, rebuilt, turbo-charged and super-charged everything from Mini Coopers to the one-of-a-kind SLR McLaren racecar.  He has brought to RENN HAUS his relationships with some of the top tuners in Germany such as Evotech and MKB Germany.


Jason Christensen - Master Technician

     21 Years of Automotive Service

     Volvo Master Certified Technician-Mercedes-Benz Star Certified Technician-Volkswagen Certified Technician Technician

Jason has served in the German automotive field for over 20 years.  His vast knowledge of exactly how these cars function, gives him an unparalleled advantage to diagnose and repair your vehicle right the first time.


Kyle Lulofs - 12+ Years Experience

  • Mercedes Benz Factory Trained Master Technician of 8 years


Avrum Raynor - 16+ Years Experience 

  • Mercedes Benz Factory Trained Master Technician 




is continually looking to bring our customers the top services available in the US. With our tremendous talent and experience, along with our team's integrity and passion, RENN HAUS continues to be one of Florida's leading independent German car service, maintenance and restoration shops. 

Stop by, meet OUR TEAM and discuss any questions or ideas you may have for your fine automobile.


New layer...
New layer...
New layer...
New layer...
New layer...
New layer...

Career Opportunity

BMW Technician Opportunity

RENN HAUS is currently looking for an experienced BMW Service Technician with a minimum of 5 years experience. We offer top compensation that includes 100% employee paid health insurance and...

Read more
News and Events about Performance Transmission Installation
First Name (*)

Please type your full name.
Last Name (*)

Invalid Input
E-mail (*)

Invalid email address.

Invalid Input
Additional Info/Comments

Invalid Input