A 1972 graduate of UCLA Law School, Gregg practiced corporate securities and real estate law in Los Angeles from 1972-1978, at which point he entered the virtually nonexistent legal search business. Joining with Michael Greene shortly thereafter, Ziskind Greene, with offices in Los Angeles, San Francisco, Orange County and San Diego, quickly became the largest legal search firm in California with as many as twenty recruiters before Michael's untimely death in 1986. Gregg was a founder of the National Association of Legal Search Consultants in 1984, served on its Board of Directors and as the Chair of its Ethics Committee from 1984-1988, and drafted the industry's national Code of Ethics. He has written and spoken extensively throughout the nation on issues relating to legal search.
Gregg co-founded Emplawyernet in 1991 with fellow legal recruiter Bill Seaton, who continues as its CEO. Seeking to apply emerging technology to the distribution of job and career development information to lawyers and to the law firms, corporations and government agencies that employ them, Emplawyernet is a Web-based, venture capital-financed entity which is the largest repository of such information in the nation.