The management team of Sleep Management Centers has 75 years combined experience in the medical field with a primary emphasis in sleep medicine. In fact, two members of this team began their careers working in the first sleep testing facilities established in the United States. Each individual is highly skilled in a number of areas that compliment their approach to provide an exceptional level of patient care in the diagnosis and treatment of sleep disorders. A brief description of their experience is outlined below.

Andrea L. Clark, MSW, RPSGT,
is the President of Sleep Management Centers, LLC. Andrea has been in the field of sleep medicine for over 28 years first as a technologist in The Ohio State University Sleep Disorders Center and then as an administrator over multiple departments in a large hospital in the Texas Medical Center. After leaving the hospital setting in 1999 she set up and managed two free standing sleep laboratories in the Houston area. Andrea has served on the Board of the Association of Polysomnographic Technologists and several committees including as an examiner and member of the Exam Development Committee of the BRPT (Board of Registered Polysomnographic Technologists). She has extensive experience in the design, implementation, and operations of sleep centers, in a variety of settings.

Marietta B. Bibbs, BS, RPSGT,
is the Vice President and Director of Technical Development at Sleep Management Centers, LLC. Marietta has over 31 years experience in sleep medicine starting in the Baylor College of Medicine Sleep Disorders Center, one of the first sleep labs in the country. She is known world wide as a trainer, author and mentor to technologists and physicians alike. Ms. Bibbs is a past president of the Board of Registered Polysomnographic Technologists where she has been instrumental in the development of credentialing Polysomnographic Technologists. She is currently chair of the Educational Advisory Committee of the BRPT. Marietta has received numerous honors and high level awards for her contribution to sleep medicine during her career.

Tracy H. Zappa,
is the Vice President and Director of Business Services at Sleep Management Centers, LLC. Tracy has been employed in the medical field for the past 16 years beginning her career in the Materials Management Department with the Methodist Hospital in Houston TX. After leaving the hospital setting in 1995 she began employment with a local home health care company as the office and billing manager. She has since worked for a durable medical equipment company and a free-standing sleep laboratory in Houston where she was responsible for billing and collections of diagnostic and treatment procedures. Tracy is certified in both medical insurance billing and coding.