COMMENTARY Dr. Robert M. Gresham / Contributing Editor CLS at 20 After two decades, STLE’s signature service remains the standard of excellence for those who practice lubrication engineering. CERTIFIED LUBRICATION SPECIALIST™ —the highly successful STLE program better known simply as CLS™—has grown and ﬂour-ished over the years. Today, 20 years after it was ﬁrst launched in 1993, it remains the standard of excellence for those who practice the art of lubrication engineering. Not everything has remained the same, of course. CLS has adapted to the times. For example, the demographics of cer-tiﬁcation holders have changed somewhat as more and more chemical suppliers and technical sales people perform the du-ties of the historic lubrication engineer for which the certiﬁca-tion was originally intended. And the designation has expanded 20 Looking for work? Check out STLE’s Career Center to ﬁnd a job that’s right for you. Details at www.stle.org .