Ask any lawyer how to measure success and expect an assortment of answers. Winning the big case. Financial security. Respect from peers. Honors and awards.Sole practitioners can add a less sublime goal to the list — longevity. Competing effectively in the legal marketplace, with finite resources and long hours, can take its toll. As the years mount, some opt for other law firms, in-house positions or government work.Not so with Mark J. Rose, a dyed-in-the-wool sole practitioner and litigator for 35 years.Rose, a …