The Behavior Analysts Certification Board is the official credentialling body in the field of Applied Behavior Analysis. Their website is: www.BACB.com

There are 2 levels of Board Certification by the BACB.
They are:
     Board Certified Behavior Analyst or BCBA requires at least a Masters Degree, specified coursework and internship, and a passing grade on the  BCBA exam.          
     and
     Board Certified Associate Behavior Analyst requires at least a Bachelors Degree, specified coursework and internship, and a passing grade on the BCABA exam. 

The following decriptions are adapted from the BACB website.

Board Certified Behavior Analyst® (BCBA®):

The Board Certified Behavior Analyst is an independent practitioner who also may work as an employee or independent contractor for an organization. The BCBA conducts descriptive and systematic  behavioral assessments, including functional analyses, and provides behavior analytic interpretations of the results. The BCBA designs and supervises behavior analytic interventions. The BCBA is able to effectively develop and implement appropriate assessment and intervention methods for use in unfamiliar situations and for a range of cases. The BCBA seeks the consultation of more experienced practitioners when necessary. The BCBA teaches others to carry out ethical and effective behavior analytic interventions based on published research and designs and delivers instruction in behavior analysis. It is strongly recommended that the BCBA supervise the work of Board Certified Associate Behavior Analysts and others who implement behavior analytic interventions.

Board Certified Associate Behavior Analyst® (BCABA®):

The BCABA conducts descriptive behavioral assessments and is able to interpret the results and design ethical and effective behavior analytic interventions for clients. The BCABA designs and oversees interventions in familiar cases (e.g., similar to those encountered during their training) that are consistent with the dimensions of applied behavior analysis. The BCABA obtains technical direction from a BCBA for unfamiliar situations. The BCABA is able to teach others to carry out interventions once the BCABA has demonstrated competency with the procedures involved under the direct supervision of a BCBA. The BCABA may assist a BCBA with the design and delivery of introductory level instruction in behavior analysis. It is strongly recommended that the BCABA practice under the supervision of a BCBA, and that those governmental entities regulating BCABAs require this supervision.

The trademarks "Behavior Analyst

Colleges and Universities offering course sequences in ABA

Announcement:
Ball State University and Indiana University South Bend are now offering
course sequences designed to prepare students for Certification exams.
 
Ball State University, Teachers College, Special Ed Masters program -
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Indiana University South Bend, Psychology Bachelor's program -
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Indiana Students have also attended Southern Illinois University in Carbondale, Illinois and Western Michigan University in Kalamazoo
for courses and programs in Applied Behavior Analysis.

www.BACB.com has a long list of Colleges and Universities around the world who offer course sequences for certification. There are many programs offering distance programs, including North Texas University, and Southern Illinois University.