杰弗瑞•凯勒，态度决定一切公司主席，曾与有志于培养成功人士的公司合作，也曾与希望客户更为乐观积极的销售经理合作过。作者做过有关积极性及人类经商潜质、社团、教育机构等的振奋人心的展示型陈述。
杰夫•凯勒与读者们分享了自己的第一手经验：让平庸而消极的态度转化为积极的态度需要作出什么改变?如何让你的积极态度更进一层？他用诚挚、清晰且极具感染力的口吻向我们娓娓道来，同时以一种触动思想及心灵的方式打动读者。杰夫•凯勒的基本原则之一便是人人都被赋予了欢笑的权利，有权在享受其展示的同时获得乐趣，因为他坚信幽默有助于我们更好的学习与成长。
杰夫•凯勒著有畅销书《态度决定一切》，其中包括十二章有关于态度与成功的课程，目前已售超过15万册，并被译为六种语言。
14年来，杰夫•凯勒一直潜心《态度决定一切内部通讯》的编辑创作，该刊收到了来自于zigziglar及博士后诺曼•文森特•皮勒的一致褒奖。杰夫•凯勒还著有线上通讯月刊《成功之路》；及月刊the monthly motivator（TM），两种刊物都强调积极的态度与成功准则，这些出版物已激励了数以千计的读者去探索其潜能的极限。此外，杰夫•凯勒还制作了一档视屏节目“伟大之路”，以及一档音像节目：“花生汤里的成功学”。
杰夫•凯勒的文章：Selling Power, The Pryor Report Management Newsletter, The Toastmaster and The Chamber of Commerce Pacesetter等曾发表在全国级国际性的出版刊物上，读者也可在销售医生杂志的网站上阅读其文章。
杰夫•凯勒于1976年毕业于汉密尔顿学院，1980年于霍夫斯特拉大学法学院获得法学学位。杰夫是一名律师，从事目前的事业前，他已在法律行业工作了10余年。目前杰夫是一名全职演说家及作家。作者为全国演讲协会成员。
Jeffrey Keller president of Attitude is Everything, Inc., works with organizations that want to develop achievers, and with sales managers who want their people to be more positive. He delivers his uplifting presentations in the area of motivation and human potential to businesses, associations and educational institutions.
Jeff Keller shares with his audiences his firsthand experiences about what it takes to transform a mediocre or negative attitude into a positive one, and how to take a positive attitude to an even higher level. He communicates with sincerity, clarity and impact, in a way that touches the minds and hearts of those in the audience. One of Jeff Keller’s ground rules is that everyone is entitled to laugh and have some fun during his presentation, because he believes that humor contributes to the learning environment.
Jeff Keller is the author of the best-selling book, Attitude is Everything, which consists of 12 lessons on attitude and success. More than 150,000 copies have been sold, and the book has been translated into six foreign languages.
For more than 14 years, Jeff Keller has written the Attitude is Everything Newsletter, which received high praise from Zig Ziglar and the late Dr. Norman Vincent Peale. Jeff Keller is also the author of Here’s to Your Success, a monthly online newsletter, and The Monthly Motivator(TM), a monthly publication, both of which reinforce a positive attitude and success principles. These publications have inspired thousands of people to explore the limits of their potential. Additionally. Jeff Keller is the producer of the video program, "Your Path To Greatness," and the audio program, "Success from Soup to Nuts."
Jeff Keller’s articles have appeared in national and international publications, including: Selling Power, The Pryor Report Management Newsletter, The Toastmaster and The Chamber of Commerce Pacesetter. His articles can also be found on the Internet at the web site for Salesdoctors Magazine.
Jeff Keller graduated from Hamilton College in 1976 and received his law degree from Hofstra University School of Law in 1980. He is an attorney and practiced law for more than ten years before pursuing his current career as a fulltime speaker and writer. He is a member of the National Speakers Association.